n.
1.a building housing an instrument for projecting the positions of the planets onto a domed ceiling
2.an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
3.an apparatus or model for representing the solar systems
Idiom of the Day
rain (something) out or rain out (something)
to spoil something by raining
The music festival was rained out yesterday evening.