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
psych (someone) out or psych out (someone)
to find out the real motives or intentions of someone
I tried to psych out the salesman to see how much he would sell the car for.