At our astronomy meeting tonight, we heard a lecture on the history of planetaria. "Planetaria" is the plural of "planetarium" which is where we see shows of stars in the sky at night, in a dome. The Vanderbilt Planetarium, where we meet, has a very modern sky projector. Dave, the speaker, talked about the evolution of sky projectors, and had a few pieces of the older projector which had been installed in 1971. This piece is called a "star plate" and is one of many from the old projector. This piece projects images of all the stars in a particular part of the sky. We got to pick this device up, point it at a bright light, and see brilliant stars against a black sky.
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