The Adler Planetarium & Astronomy Museum is a planetarium in Chicago, Illinois, U.S.. It was the first planetarium built in the Western Hemisphere and is the oldest in existence. The planetarium was founded and built in 1930 by the philanthropist Max Adler, with the assistance of the first director of the planetarium, Philip Fox. The Adler Planetarium opened to the public on May 12, 1930.