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Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
a solar day
Venus "sidereal day" is longer than its year. Mercury's "solar day" is longer than its year. However, there is no planet in our solar system with a day longer than our year on Earth.
Its to do with the time taken for the planet to rotate once on it axis, Mars just takes a little longer, making its apparent day longer.
The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds.
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day)
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
Mars. It has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
a solar day
Its position and apparent movement around the sky. "Apparent solar time" is based on the "apparent solar day", reckoned by defining as 'solar noon' the moment of the Sun's highest altitude above the horizon on any given day. (That's when the Sun crosses the observer's meridian.) Apparent solar days do not have the exact same length (from one solar noon to the next) throughout the year, which is surprising to some at first. This is why the first approaches to creating a solid "standard time" involved determining the length of the 'mean solar day' (average solar day).
Standard solar time
Almost. Mars has a similar day length to Earth, a little longer at 24h 39m 35s (apparent solar day).
It's the average length of the "apparent solar day" throughout the year, 24 hours exactly for planet Earth.
An apparent or solar day on mars is 24h 39min and 35sec, so a night on mars will be 12h 19min and 47sec on average. A bit longer than on earth.
Because, when using "apparent solar time", the length of a "solar day" varies slightly during the year. (This is because the Earth's orbit isn't exactly circular and the Earth's axis is tilted.) "Clock time" is based on an average (or "mean") of these day lengths, called the "mean solar day". So clocks use "mean solar time". (By coincidence, on the date the question was answered (14th April) "apparent solar time" and 'clock' time are synchronised.) There's another reason for apparent solar time being different from clock time. "Clock time" uses time zones. So, over a wide area, the time on a clock equals the "mean solar time" at a particular, defining, longitude.
the amount of time the sun takes to cross the meridian twice