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Rotation in astronomy means how long it takes for an object to rotate once on it's axis. [See related link]

Imagine a ball with a spike through it. If you spin the ball once, so the same spot is facing you, this is rotation. It's what a day is called on a planet. One rotation around it's axis.

Revolution on the other hand, is the time it takes a planet to orbit the Sun or a star and this is what a year is.

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14y ago

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