Timekeeping
UTC, MSD, MTC.
Mars Coordinated Time is the Allison & McEwen Mars24 scale — the same family of numbers mission clocks use. A sol is 1.0274912517 Earth days.
Chronometers
Two worlds, one instant
Earth · UTC
00:00:00
Thu Jan 1 1970
Mars · MTC
07:04:53
MSD 34127.295
Curiosity sol 0 · Perseverance sol 0 · Ls 315.0°
Any epoch
Earth date → Mars sol
Pick a moment to see the corresponding Mars clocks.
Reference
Two-planet constants
| Quantity | Earth | Mars |
|---|---|---|
| Sidereal day | Earth 23h 56m | Mars 24h 37m |
| Solar day | 24h 00m | 24h 39m 35s |
| Year | 365.24 d | 686.98 d / 668.6 sols |
| Gravity | 9.81 m/s² | 3.72 m/s² |
| Mean solar flux | 1361 W/m² | 586 W/m² |
| Atmosphere | 1013 mbar N₂/O₂ | ~6–10 mbar CO₂ |
Epoch
Thu Jan 1 1970 · 00:00:00 UTC
Live present
Gale-like climatology
Mars surface
Seasonal model at 5°S, not live telemetry. InSight went silent in 2022; these are Ls-driven ranges from published rover climatology.
Day max
-12°C
11°F
Night min
-74°C
-101°F
Pressure
935 Pa
9.4 mbar
Solar flux
678
W/m² at Mars
North Winter · South Summer. Regional storms are common in southern spring and summer. Wind ~9 m/s.
Lunar
Last Quarter
45%
illuminated
383 thousand km · 22.6 days since new
Gateway, not destination. Transit to lunar orbit is always open; about three days.
Mass & weight
What you weigh on Mars
154.0 lbs on Earth is 58.4 lbs on Mars — same mass, 0.38 g.