Public index · Planetary
The sol
24h 39m 35s
Mean Mars solar day · 24 h 39 m 35.244 s
A sol is a Mars solar day. Almost a terrestrial day, which is the trap. Crews live on sol clocks. Thermal design does not live on almost.
Measured clock · Fig. 2
A sol is a Mars solar day. Mean length 24 hours 39 minutes 35.244 seconds. NASA GISS Mars24. Crews live on sol clocks. Almost a terrestrial day, which is the trap.
What it supports
A published mean solar day from NASA GISS Mars24 and the NSSDC fact sheet. Redworld keeps the clock. Viking adopted the sol in 1976.
What it does not
Not 42. Not 142. The extra 39 minutes 35 seconds is a measured remainder, not a cipher.
Calculation
Mean solar day 24h 39m 35.244s = 1.02749125 Earth days
NASA GISS Mars24 mean sol. Sidereal rotation is shorter (24h 37m 22.66s).
ExactnessExact
FormOther form
Unith m s
Strengthhard