1. 天文馆；天象馆
A planetarium is a building where lights are shone on the ceiling to represent the planets and the stars and to show how they appear to move.

1. an apparatus or model for representing the solar systems

2. an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome

3. a building housing an instrument for projecting the positions of the planets onto a domed ceiling