The planets move in space, circling the Sun. This movement is called revolution. One complete revolution of a planet around the Sun corresponds to the planets year. Traveling this way around the Sun, each planet spins like a top on its axis, which is a kind of imaginary stick that runs right through the middle of the planet. This movement is called rotation. One complete rotation corresponds to the planets day.
The planets move in space, circling the Sun. This movement is called revolution. One complete revolution of a planet around the Sun corresponds to the planets year. Traveling this way around the Sun, each planet spins like a top on its axis, which is a kind of imaginary stick that runs right through the middle of the planet. This movement is called rotation. One complete rotation corresponds to the planets day.