The J.I. Holcomb Observatory and Planetarium was completed in 1954 as a gift from Mr. Holcomb and his wife, Musetta, in honor of Butler’s centennial celebration in 1955. One of the largest public observatories in the world, it houses a 38-inch Cassegrain reflector. The observatory’s lobby floor features a 14-foot replica of the zodiac in brilliantly colored terrazzo, and the 60-seat planetarium equipped with a Spitz A3P projector serves both as a laboratory and theater. Also in the observatory are a clock room and classroom. Holcomb Observatory and Planetarium serves Butler students as well as the public, and offers both public and private tours of the facility in addition to scheduled public viewing times.