Here's an exciting educational model that is fun for younger students or people unfamiliar with astronomy. Each concept is shown individually, moving the arm or earth or moon separately by hand. Shows basic relationships of rotation, revolution, night and day, seasons, phases of the moon, occurrence of tides, lunar and solar eclipses, locations and signs of the zodiac and more! Chain and gear drive maintains the north-pointing axis of the earth. A light in the yellow plastic sun globe adds to the realism of the experiments.