Introduction to the Astronomical Hall: The domestically produced large-scale planetarium in the old museum’s Astronomical Hall can project approximately 9,000 stars of magnitude 6.55 or above, as well as constellation names and constellation connections, coordinate systems and apparent motions of planets in the solar system. Also added are the names and connections of my ancient constellations Sanyuan and Twenty-Eight Constellations, as well as the twenty-four solar terms on the ecliptic. In addition, it is also equipped with nearly a hundred special effect projectors for performing comets, meteors, sunbaits, spaceships, etc., as well as slide projectors, large-screen projectors and other equipment.