Place holder for today's Calendar update for Wednesday 2026/04/08
[51.4792N, 0.0000E] 04/08/2026, 13:00:17 Europe/London
Object: Mars [open sky map]
RA 23h 57m 51s Dec -01° 20’ 16” Appar J2000
Mag: 1.24 (Estimated: JPL) Const: Pisces
Sun Dist: 206821439.93325 km [ km/s]
Earth Dist: 341562482.6944 km [ km/s]
Special note about theskylive.com
My name is Iacopo, and I am based in Northern Italy. TheSkyLive is a personal project of mine, that I have been running since its launch back in 2013.
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
259
Sol number:
498
Current ID 647
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Martian Calendar Based on Formula by RobertDyck
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Re: Martian Calendar Based on Formula by RobertDyck
===
Today on Mars: 0038/18/23 Monday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 497 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/07 Tuesday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 258.4 Sol Number: 497 Change in degrees is +.7 Julian date is: J003897
Solar Longitude: 257.7 Sol Number: 496 Change in degrees is +.6 Julian date is: J003896
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,794,017 km [26.5 km/s] Difference is +25246 <= +1052 km/hour at 12.0 on 04/07 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,768,771 km [26.5 km/s] Difference is +23140 <= +0964 km/hour at 12.0 on 04/06 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 55m 00s on 2026/04/07 at 13:00 London time
The display on theskylive.com says Mars: RA 23h 50m 20s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/07 341,800,396 (decreasing)
Earth Distance in km: 2026/04/06 342,037,229 (decreasing)
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 497 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 497 is Monday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
Today on Mars: 0038/18/23 Monday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 497 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/07 Tuesday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 258.4 Sol Number: 497 Change in degrees is +.7 Julian date is: J003897
Solar Longitude: 257.7 Sol Number: 496 Change in degrees is +.6 Julian date is: J003896
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,794,017 km [26.5 km/s] Difference is +25246 <= +1052 km/hour at 12.0 on 04/07 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,768,771 km [26.5 km/s] Difference is +23140 <= +0964 km/hour at 12.0 on 04/06 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 55m 00s on 2026/04/07 at 13:00 London time
The display on theskylive.com says Mars: RA 23h 50m 20s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 18 and 19 minutes. Communications delay would be 36+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/07 341,800,396 (decreasing)
Earth Distance in km: 2026/04/06 342,037,229 (decreasing)
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 497 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 497 is Monday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
Place holder for Calendar update for Tuesday 2026/04/07
[51.4792N, 0.0000E] 04/07/2026, 13:00:01 Europe/London
Object: Mars [open sky map]
RA 23h 55m 00s Dec -01° 39’ 07” Appar J2000
Mag: 1.23 (Estimated: JPL) Const: Pisces
Sun Dist: 206794017.92833 km [ km/s]
Earth Dist: 341800396.70597 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
258.4
Sol number:
497
Current ID 636
Who is online
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 605 • Total topics 59 • Total members 8 • Our newest member FOQ1
[51.4792N, 0.0000E] 04/07/2026, 13:00:01 Europe/London
Object: Mars [open sky map]
RA 23h 55m 00s Dec -01° 39’ 07” Appar J2000
Mag: 1.23 (Estimated: JPL) Const: Pisces
Sun Dist: 206794017.92833 km [ km/s]
Earth Dist: 341800396.70597 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
258.4
Sol number:
497
Current ID 636
Who is online
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 605 • Total topics 59 • Total members 8 • Our newest member FOQ1
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
===
Today on Mars: 0038/18/22 Sunday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 496 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/06 Monday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 257.7 Sol Number: 496 Change in degrees is +.6 Julian date is: J003896
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,768,771 km [26.5 km/s] Difference is +23140 <= +0964 km/hour at 12.0 on 04/06 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 55m 00s on 2026/04/07 at 13:00 London time
The display on theskylive.com says Mars: RA 23h 50m 20s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/06 342,037,229 (decreasing)
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 496 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 496 is Sunday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
Today on Mars: 0038/18/22 Sunday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 496 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/06 Monday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 257.7 Sol Number: 496 Change in degrees is +.6 Julian date is: J003896
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,768,771 km [26.5 km/s] Difference is +23140 <= +0964 km/hour at 12.0 on 04/06 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 55m 00s on 2026/04/07 at 13:00 London time
The display on theskylive.com says Mars: RA 23h 50m 20s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/06 342,037,229 (decreasing)
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 496 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 496 is Sunday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
Place holder for today's Calendar update for Monday April 6, 2026
[51.4792N, 0.0000E] 04/06/2026, 13:00:19 Europe/London
Object: Mars [open sky map]
RA 23h 52m 08s Dec -01° 57’ 57” Appar J2000
Mag: 1.24 (Estimated: JPL) Const: Pisces
Sun Dist: 206768771.29116 km [ km/s]
Earth Dist: 342037229.78876 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
257.7
Sol number:
496
Current ID 622
Who is online
In total there are 2 users online :: 2 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: RobertDyck, tahanson43206
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Total posts 591 • Total topics 57 • Total members 8 • Our newest member FOQ1
[51.4792N, 0.0000E] 04/06/2026, 13:00:19 Europe/London
Object: Mars [open sky map]
RA 23h 52m 08s Dec -01° 57’ 57” Appar J2000
Mag: 1.24 (Estimated: JPL) Const: Pisces
Sun Dist: 206768771.29116 km [ km/s]
Earth Dist: 342037229.78876 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
257.7
Sol number:
496
Current ID 622
Who is online
In total there are 2 users online :: 2 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: RobertDyck, tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 591 • Total topics 57 • Total members 8 • Our newest member FOQ1
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
===
Today on Mars: 0038/18/21 Saturday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 495 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/05 Sunday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 50m 20s
Mars is about 3.5 hours ahead RA 23h 45m 27.0s Psyche RA 23h 44m 55.4s
Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 495 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 495 is Saturday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
Today on Mars: 0038/18/21 Saturday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 495 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/05 Sunday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 257.1 Sol Number: 495 Change in degrees is +.6 Julian date is: J003895
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,745,631 km [26.5 km/s] Difference is +20949 <= +0873 km/hour at 12.0 on 04/05 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: The display on theskylive.com says Mars: RA 23h 50m 20s
Mars is about 3.5 hours ahead RA 23h 45m 27.0s Psyche RA 23h 44m 55.4s
Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/05 342,273,730 (decreasing)
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 495 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 495 is Saturday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
Place holder for today's Calendar update for Easter Sunday 2026/04/05
[51.4792N, 0.0000E] 04/05/2026, 13:00:07 Europe/London
Object: Mars [open sky map]
RA 23h 49m 16s Dec -02° 16’ 47” Appar J2000
Mag: 1.25 (Estimated: JPL) Const: Pisces
Sun Dist: 206745631.59346 km [ km/s]
Earth Dist: 342273729.97217 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
257.1
Sol number:
495
Current ID 599
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 568 • Total topics 54 • Total members 9 • Our newest member FOQ1
[51.4792N, 0.0000E] 04/05/2026, 13:00:07 Europe/London
Object: Mars [open sky map]
RA 23h 49m 16s Dec -02° 16’ 47” Appar J2000
Mag: 1.25 (Estimated: JPL) Const: Pisces
Sun Dist: 206745631.59346 km [ km/s]
Earth Dist: 342273729.97217 km [ km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
257.1
Sol number:
495
Current ID 599
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 568 • Total topics 54 • Total members 9 • Our newest member FOQ1
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
===
Today on Mars: 0038/18/20 Friday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 494 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/04 Saturday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
Solar Longitude: 255.2 Sol Number: 492 Change in degrees is +.6 Julian date is: J003892
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,689,215 km [26.5 km/s] Difference is +14488 <= +0604 km/hour at 12.0 on 04/02 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: Mars is about 3.5 hours ahead RA 23h 45m 27.0s Psyche RA 23h 44m 55.4s
Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
Earth Distance in km: 2026/04/02 342.978,444 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 494 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 494 is Friday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
Today on Mars: 0038/18/20 Friday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 494 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/04 Saturday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 256.5 Sol Number: 494 Change in degrees is +.7 Julian date is: J003894
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
Solar Longitude: 255.2 Sol Number: 492 Change in degrees is +.6 Julian date is: J003892
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,724,682 km [26.5 km/s] Difference is +18810 <= +0784 km/hour at 12.0 on 04/04 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,689,215 km [26.5 km/s] Difference is +14488 <= +0604 km/hour at 12.0 on 04/02 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: Mars is about 3.5 hours ahead RA 23h 45m 27.0s Psyche RA 23h 44m 55.4s
Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/04 342,509,139 (decreasing)
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
Earth Distance in km: 2026/04/02 342.978,444 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 494 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 494 is Friday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
Place holder for today's Calendar update for Saturday 2026/04/04
[51.4792N, 0.0000E] 04/04/2026, 13:00:09 Europe/London
Object: Mars [open sky map]
RA 23h 46m 25.3s Dec -02° 35' 36.3" Appar J2000
Mag: 1.26 (Estimated: JPL) Const: Pisces
Sun Dist: 206,724,682 km [26.5 km/s]
Earth Dist: 342,509,139 km [54.1 km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
256.5
Sol number:
494
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 547 • Total topics 54 • Total members 9 • Our newest member FOQ1
Current ID 578
[51.4792N, 0.0000E] 04/04/2026, 13:00:09 Europe/London
Object: Mars [open sky map]
RA 23h 46m 25.3s Dec -02° 35' 36.3" Appar J2000
Mag: 1.26 (Estimated: JPL) Const: Pisces
Sun Dist: 206,724,682 km [26.5 km/s]
Earth Dist: 342,509,139 km [54.1 km/s]
Martian Year:
38
Martian Astronomical Month:
9
Solar longitude Ls:
256.5
Sol number:
494
In total there is 1 user online :: 1 registered, 0 hidden and 0 guests (based on users active over the past 5 minutes)
Most users ever online was 853 on Mon Oct 27, 2025 12:49 am
Registered users: tahanson43206
Legend: Administrators, Global moderators, Inactive Users
Birthdays
No birthdays today
Statistics
Total posts 547 • Total topics 54 • Total members 9 • Our newest member FOQ1
Current ID 578
-
tahanson43206
- Site Admin
- Posts: 493
- Joined: Wed Apr 10, 2024 11:24 pm
- Location: Earth
- Contact:
Re: Martian Calendar Based on Formula by RobertDyck
===
Today on Mars: 0038/18/19 Thursday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 493 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/03 Friday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
Solar Longitude: 255.2 Sol Number: 492 Change in degrees is +.6 Julian date is: J003892
Solar Longitude: 254.6 Sol Number: 491 Change in degrees is +.7 Julian date is: J003891
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,689,215 km [26.5 km/s] Difference is +14488 <= +0604 km/hour at 12.0 on 04/02 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,674,727 km [26.5 km/s] Difference is +12330 <= +0514 km/hour at 12.0 on 04/01 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
Mars is about 2 hours ahead of Psyche RA 23h 39m 19.2s Mars RA 23h 34m 44.1s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
Earth Distance in km: 2026/04/02 342.978,444 (decreasing)
Earth Distance in km: 2026/04/01 343,212,148 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 493 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 493 is Thursday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18
Today on Mars: 0038/18/19 Thursday Days of the week OFFSET 1 with Earth. (count from Mars to Earth )
Sol 493 Business Month 18 Sixth month of Quarter 3 of Year 38
Today on Earth: 2026/04/03 Friday Earth Date) Post Title: Today on Mars
====*====*====
To see how this calendar works, we show the standard 28 day month at the bottom of this daily report.
There are 20 months of 28 Sols and 4 months of 27 Sols at the end of the four six-month quarters.
New Years Eve is extended to align the Business Calendar for Mars with the Astronomical calendar.
Business and Astronomical both start at zero (to the nanosecond) on New Year's Day.
This calendar has been in operation for two full Mars years (36 and 37). We are in Year 38
This calendar is NOT the Darian Calendar!
Per http://www-mars.lmd.jussieu.fr/mars/tim ... _time.html also see: in-the-sky.org for opposition/perigee/aphelion
Martian Year: 38 Martian Astronomical Interval in 12 interval format: 9 <<== The Astronomical interval
Check Longitude: the interval will increment when longitude reaches 270 degrees
===
Solar Longitude: 255.8 Sol Number: 493 Change in degrees is +.6 Julian date is: J003893
Solar Longitude: 255.2 Sol Number: 492 Change in degrees is +.6 Julian date is: J003892
Solar Longitude: 254.6 Sol Number: 491 Change in degrees is +.7 Julian date is: J003891
#>
Note that Solar Longitude measurement varies as a function of location in orbit. Ls 0 is the moment when the Sun appears to transit from one hemisphere to the other. Update from Mars.NASA.gov (The Sun crosses the equator of Mars (Vernal Equinox)). The transition itself is a function of the tilt of an object with respect to the Solar plane. Per squarewidget.com, Hipparchus created the celestial coordinate system we use today.
Note#2: https://theskylive.com/mars-tracker This web site shows the astronomical position of Mars as seen from Earth
Todo: At next Aphelion/Perihelion record the Mars date as J00##### (and set Search term)
Perihelion occurred in 2026 at Ls 251 on Sol 486 - Earth Date 2026/03/27 Next: (estimated) 2028/05/15
Perihelion occurred in 2024 at Ls 251 on Sol 485 - Earth Date 2024/05/08 Next: (estimated) 2026/03/06 (actual) 2026/03/26
Perihelion occurred in 2022 at Ls 251 on Sol 485 - Earth Date 2022/06/21 Next: (actual) 2024/05/08
Aphelion Earth Dates: Next: 2027/03/04 Earlier: 2025/04/16, 2023/05/30, 2021/07/12, 2019/08/25, 2017/10/07, 2015/11/20
Aphelion occurred at--- Ls 071 on Sol 152.
Aphelion occurred near Ls 070 on Sol 153 (per http://www.planetary.org)
Note#3: The computations below are dependent upon both the computations provided by the reference web site and by accuracy of recording of the time of observations. The calculations use tenths of hours. The Sun Distance needs to be captured at the moment the time increments to a given tenth.
Note on data below: The figure quoted after distance is a rate of progress along the orbital path [exact meaning to be determined]
Minus prefix means Mars is approaching the Sun. Plus prefix means Mars is moving away from the Sun.
The figure computed to the right of "Difference" is the rate of change of the distance to Sun. Increasing to Aphelion/Decreasing to Perihelion.
Aphelion of Mars is due March 04, 2027 Sol 151-152 Note velocity of Mars was 22.0 km/s nearing Aphelion (21.97 km/s)
Perhelion of Mars is due May, 2028 Sol 251 Note velocity of Mars was 26.5 km/s nearing Perhelion 2026/03/26
===
Distance: Mars >> Sun per theskylive.com: 206,705,872 km [26.5 km/s] Difference is +16657 <= +0694 km/hour at 12.0 on 04/03 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,689,215 km [26.5 km/s] Difference is +14488 <= +0604 km/hour at 12.0 on 04/02 (time 12:00) (24.0 hours)
Distance: Mars >> Sun per theskylive.com: 206,674,727 km [26.5 km/s] Difference is +12330 <= +0514 km/hour at 12.0 on 04/01 (time 12:00) (24.0 hours)
==*==*==*
Observation: The sky view is ** filled ** with objects and some have been recorded and given identification by humans or their robot assistants
And! ** All ** the location assignments are from the perspective of Earth. The entire catalog needs to be adjusted when inter-stellar travel begins
The work that lies ahead for the astronomical community is daunting - there is work ahead for centuries
2022/01/19 - All current (existing) stellar catalogs are computed with reference to the Earth. Another civilization would use it's planet as reference.
Perhaps a Milky Way frame of reference will become necessary at some point. The Earth is as good a Zero point as any, for humans.
=== Mars is in Regular movement as seen from Earth.
Next ahead: Mars is ahead of Psyche about 3 hours RA 23h 42m 03.9s Mars 23h 42m 32.9s
Mars is about 2 hours ahead of Psyche RA 23h 39m 19.2s Mars RA 23h 34m 44.1s
====*====*===
Zoom Out Capability As a general observation ... I've become increasingly interested in knowing what the larger view of the sky might be like.
The site: theskylive.com does a terrific job of matching the view from Earth towards Mars, against a background of actual astronomical plates.
I wish there were a way (or rather, I wish I ** knew ** about a way that may exist) to enlarge the view until the entire galaxy is in view (Zoom out)
Update 2022/12/08 TheSkyLive.com provides a large view of selected objects: Select [Major Bodies] Then select [Information] in the body of interest
Update 2022/12/08 Scroll down to (body) Position and Finder Charts. Field of view is 50x30 degrees.
Light travel in one second is (about) 300,000 kilometers. The distance covered in one minute is about 18,000,000 kilometers. Estimated light times:
1:18,2:36,3:54,4:72,5:90,6:108,7:126,8:144,9:162,10:180,11:198,12:216,13:234,14:252,15:270,16:288,17:306,18:324, 19:342,20:360,21:378,22:396
Light travel time today is between 19 and 20 minutes. Communications delay would be 38+ minutes round trip.
=== Time estimate will change below 342
Earth Distance in km: 2026/04/03 342,774,059 (decreasing)
Earth Distance in km: 2026/04/02 342.978,444 (decreasing)
Earth Distance in km: 2026/04/01 343,212,148 (decreasing)
<<#
Maximum Earth-Mars distance is estimated to be 401 million kilometers (both at apogee and opposite vs Sun) Minimum is about 56 million kilometers
Mars and Earth were in Opposition (Earth center) in December of 2022. The date coincided with a (very rare) occultation of Mars by the Moon.
Mars and Earth were in Conjunction (Sun center) in November of 2023.
Mars and Earth appear to have been as close as they will get in Year 36. 81,454,323 kilometers on J0036644 Time: 4.53 minutes - 9 minutes round trip
In his online interview with Dr. Zubrin at the 2020 Mars Conference, Elon Musk reminded the audience that communications with Mars will necessarily include an intermediary station to handle traffic when the Sun is between Mars and Earth. Communications delays in that circumstance will increase due to the extra distance to be covered. Mr. Musk indicated he expects such communication will be handled by laser. Location would be optimum at poles of solar plane.
This web site offers an online model of the solar system: www.solarsystemscope.com It requires Chrome 57, Firefox 52 or Safari 10.1. Viewed 2022/10/13: Opposition will occur some time in December of 2022. Per earthsky.org, the date is December 8, 2022.
This web site offers an online orrery view of the Solar System: https://www.theplanetstoday.com/
===
Sol 493 is in Month 18 of a Proposed 24 month calendar. See Post 19 of Holidays topic for a summary.
Month 18 extends from Sol 475 through 501. <<== There are 27 days in Month 18. See post 82 of Holidays topic for current details.
Direct path to source: http://newmars.com/forums/viewtopic.php ... 57#p154257
Sol 493 is Thursday in the Proposed Business calendar for Mars. Sol 486 was a Skip Day on Mars. Next is near 523 of Year 38
##
The Next New Year's on Mars will occur when Solar Longitude reaches 360 degrees. Year 38 started November 12, 2024 on Earth
Per www.planetary.org Year 36 started 2021/02/07 on Earth. Mars Year 37 began 2022/12/27 on Earth.
Days of the Week Alignment:
Days of the week fall behind Earth due to the longer Sol, but they also change when Friday is omitted at the end of a Quarter
337 Earth days were observed to elapse in the 2020 weekday cycle. There were 7 week day transitions and 2 Quarter ends.
The next cycle began on the first Sol of the period of coincidence. The alignment of weekdays interval is in the range: (310 - 337)
To find the first day of a period of coincidence: Set up: SearchTerm(colon) and (colon)Alignment and J0036* or J0037*
The most recent End-Of-Quarter change occurred: … The search specified above gave 11 pages of results.
For current weather on Mars see:
***https://mars.nasa.gov/insight/weather/***
***Insight's weather info has been suspended and now is directing to msl*** <<-- Insight's mission is over (2022)
https://mars.nasa.gov/msl/weather/
Per SpaceNut: Here is another web page by NASA containing the latest news releases
https://mars.nasa.gov/news/?page=0&per_ ... ope=Latest
All forum members are invited to post significant events for this day.
Events of interest will be ON Mars, or relate to Mars. Examples are launches, landings, discoveries
Standard Month in Mars Business Calendar Copyright ® 2023 NewMars.com Mars Society
Su Mo Tu We Th Fr Sa
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
Recruiting text may be found at the bottom of this post: http://newmars.com/forums/viewtopic.php ... 57#p154257
Copyright the Mars Society All Rights Reserved
Month 18 of 24: Last month of Quarter 3 << There are 27 days in Month 18