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Mercury's rotation period is 59 Earth days. Mercury is an inner planet that is also the closest to the sun. Mercury is a small planet with an equatorial diameter of 4,879 kilometers. Mercury's gravity is 38 percent that of the Earth's. Mercury does not have moons associated with it. However, it does have many craters as the result of collisions from asteroids and comets.
The net result is that the average orbital motion of four degrees per day slows to only 2/3 of that, or less than three degrees per day. The ROTATIONAL speed of Mercury on its axis, however, does NOT change.