Chicago Park District
Demonstration of the Planetarium instrument. It projects into the dome a miniature universe. So perfectly is this portrayed that one has the feeling of looking into the true heaven. Here one can see the celestial host in its daily journey across the sky, can see the Sun, Moon and planets threading their ways among the stars, and can see the changing aspect of the sky due to change of position on the Earth or due to precessional motion. The day, the year, and the precessional cycle can be shortened into minutes or even seconds.
This vintage postcard is unused.
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The Adler Planetarium opened to the public on May 12, 1930. It is America's first planetarium and part of Chicago's Museum Campus, which includes the John G. Shedd Aquarium and The Field Museum.