Übersetzen...
Automatische Übersetzung:
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.