Earth's rotation - the complete spin of an object around its axis. causes day and night. One rotation takes 24 hours, revolution - one complete trip around an object in a circular or nearly circular path, phase - an apparent change in the Moon's shape, solar system - the Sun and all the objects that travel around it, comet - a chunk of ice, rock, and dust that moves around the Sun, constellation - a group of stars that appear to form a pattern in the night sk, axis - real or imaginary line that an object spins around., apparent motion - the way something appears, or seems, to move. The Sun appears to rise in the east. It seems to set in the west.,

The Universe

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