The average duration of the day-night cycle on Mars i.e., a Martian day is 24 hours, 39 minutes and 35.244 seconds, equivalent to 1.02749125 Earth days.
The sidereal rotational period of Mars—its rotation compared to the fixed stars—is only 24 hours, 37 minutes and 22.66 seconds. The solar day lasts slightly longer because of its orbit around the sun which requires it to turn slightly further on its axis.
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