Planetarium refers to a popular science institution which mainly disseminates astronomical knowledge. Planetarium is its necessary equipment, placed in the sky hall with hemispherical roof. It can put all kinds of astronomical phenomena on the artificial sky screen for astronomical performance and explain all kinds of astronomical phenomena.
Many planetariums often have small observatories engaged in astronomical popularization activities. Planetarium engages in astronomical popularization through astronomical performances, astronomical lectures, showing astronomical popular science education films, holding astronomical photo exhibitions, publishing astronomical popularization books and publications, organizing astronomical observation activities, and assisting in making small telescopes and astronomical teaching AIDS.
1928, the world's first planetarium was built in Munich, Germany. There are more than 100 large planetariums in the world, and there are countless small and medium planetariums. 1958, the first large planetarium, the Beijing Planetarium, was established in China, and dozens of smaller planetariums were built in China.