planetarium [ˌplanɪˈtɛːrɪəm] (pl. planetariums 或 planetaria -rɪə)
a domed building in which images of stars, planets, and constellations are projected for public entertainment or education 天文馆,天象放映馆 ■a device used to project such images 天象仪
another term for orrery 同 orrery
语源
mid 18th cent.: modern Latin, from Latin planetarius 'relating to the planets'