Yerkes Observatory is a facility of the Department of Astronomy and Astrophysics of theUniversity of Chicago. It was established in 1897 on Geneva Lake in Williams Bay, Wisconsin. Until the mid-1960’s, Yerkes Observatory housed all of the Department’s activities. Today the 77-acre, park-like site in southeast Wisconsin provides laboratory space and access to telescopes for research and instruction.
Yerkes Observatory occupies a unique niche for the educational and the scientific community. It bridges several important perspectives in formal and informal education. The history of astronomy and astrophysics of the observatory is a solid foundation for introducing all the important topics in current research as well as the practice of observational astronomy. There is a huge range of opportunities for learning. Because of Yerkes’ historical context, the world of professional and student astronomers and astronomy educators is drawn to the observatory. These communities learn from one another, build relationships, and create programs, which result in enriched experiences and learning opportunities for young and diverse members of our society.

Tour Yerkes on Saturdays, Throughout the Year
Yerkes Observatory is open to the public from 9:45 a.m. to 1:30 p.m. every Saturday throughout the year, excluding Christmas and New Year’s Day. Our expert, engaging and entertaining tour guides provide a fascinating program covering the Observatory’s history, architectural detail, astronomical research, and a look inside the 90-foot dome at the 40-inch refractor, still the largest lens-type telescope in the world.

Our general public tours are most appropriate for ages 6 and up.

Saturday tours begin at 10:00 a.m., 11:00 a.m., and 12:00 p.m. Most tours last 45 to 50 minutes. We do not accept reservations. A suggested donation of $8 per person is requested to support our public programs. Groups of 20 or more should consider reserving a private program outside of Saturday public tour hours.

The interior of the 90-foot dome is not temperature controlled, so dress appropriately on the day of your visit the same as for any outdoor activity.

Visitors are encouraged to browse our unique gift shop featuring postcards, apparel, photos from the Observatory’s archives, jewelry, meteorites, posters, books, aids for viewing the night sky and some unique items found only at Yerkes Observatory.

Yerkes Observatory

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