Description:Creative Kids DIY Sun-Moon-Earth Geography Model Children Scientific Experiment Teaching Toys Kits. Description:The purpose of the utility model is to provide a moon-system motion model. Can not only objectively reflect the space position of the three celestial bodies, namely the sun, the earth and the moon. But also demonstrate the operating conditions of the sun, the earth and the moon intuitively and systematically. As well as various natural phenomena produced by the mutual motion of the three celestial bodies. Knowledge Class:The principle of Sun Moon Earth model is moving rule between Sun Moon Earth. The model consists of three small spheres representing the sun, the earth and the moon, and has mechanical linkages to demonstrate the three-balls relationship and astronomical phenomena resulting. In order to mimic the reality of nature, the central sun usually uses a glowing light bulb to lighten the earth and the moon. The earth orbited the sun, and the moon orbited the earth at an angle to the earth's orbit around the sun. The model can demonstrate solar and lunar eclipses,phases of the moon, the earth's rotation and revolution, and the alternation of day night and the seasons. Features:It is a kind of educational toy that can exercise children's hands-on ability. While playing,your kids can better understand some knowledge of circuits and geography. Specifications:Material: Green Wood+Plastic+FoamSize: 12 X 8cm/4. 72 X 3. 15"Suitable Age: 5Y+Difficulty Level: 2 StarsNote:1. Please note that during assembly,the red wire is connected to the positive electrode of the battery box. The blue one is connected to the negative electrode. 2. It does not include the battery, the color of the accessory are random,please read carefully before buying. 3. Children should play with adult because it contains small accessories and sharp objects, please take care of children to avoid swallowing. 4. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you5. Please allow 1-3mm measuring deviation due to manual measurement. Package included:1 X DIY Sun-Moon-Earth Model Kit.