Dual purpose lighting, 320mm.

The celestial globe is a model used for navigation, astronomy teaching and the popularization of astronomy auxiliary instrument, it expressed the apparent motion of celestial bodies, coordinate and solve some practical problems by astronomical people.The position, star name, constellation, and symbols of several celestial coordinate systems are plotted on the sphere.                               

The celestial sphere is an imaginary sphere introduced into the position and motion of celestial bodies.                                       

According to the selected celestial center is different, a station, and the heliocentric celestial celestial sphere, all celestial bodies on the earth are not the same distance from the observer.