Space Travel and Exploration
Planetary Science
Planet Mars
Planet Venus

How long is a day on your planet compared to earth?



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This can be measured by the rotational speed of the planet and the distance it is away from the sun. These two variables must be known. after this you must then know where you are situated on that planet and its overall size and if its axis of rotation is inclined to the orbital plane to figure out exactly the length of a day.