Planetary Science
Planet Mars
Planet Mercury

What is a day on Mars?

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September 11, 2017 6:21AM

A day is defined as the time it takes the planet to do one complete turn on its axis.

A day on Mars is 1.025957 days or 24.622 hours or 24 hours and 37minutes long.

Mars is smaller that Earth but its rotational speed is slower than Earth.

The rotation period of Mars (one full turn around its axis) is slightly longer than one Earth day.

More precisely it is 24 hours, 37 minutes, 22.663 seconds, otherwise expressed as 1.02595675 Earth days.

Improvement: First there are two main definitions of the

word "day". There is the sidereal day and the solar day. It's the

sidereal day that's the time taken for a planet to spin once on its axis.

The solar day depends on a planet's orbital motion as well as its

axial spin.

I notice you have used 24 hours as an "Earth day". That's the

solar day length.
A day on Mars is 24 hours, 39 minutes and 35 seconds