Three-Ball Instrument Earth Motion Instrument Astronomy/Simulation Sun Earth Moon Running with Light Three-Finger Peak

It is composed of three spheres representing the sun, the earth, and the moon, and is equipped with a mechanical linkage system to demonstrate the relationships among the three celestial bodies and some of the astronomical phenomena resulting from them. To mimic the true conditions of nature, the central sun is usually illuminated by a light bulb to illuminate the earth and the moon. The earth rotates around the sun on an inclined orbit, and the moon orbits the earth's orbit, which intersects with the earth's orbit around the sun at an angle. This allows for the demonstration of solar and lunar eclipses, the phases of the moon, the earth's rotation and revolution, the alternation of day and night, and the seasons, among other phenomena.
 The demonstration is required to be conducted in a darkened room. Push the tray continuously with your hand, and the Earth orbits the sun, and the moon rotates around the Earth.