Brief Introduction for Optical Planetarium Projector
The planetarium projector is a popular science instrument that simulates starry sky performances, also known as a fake planetarium. Through the projection of the instrument, various celestial objects seen by people at different longitudes and latitudes on the earth are demonstrated on a hemispherical sky screen. Its basic principle is to restore and project the starry sky composed of optical star films onto a hemispherical dome screen through an optical lens to form an artificial starry sky.