Yerkes Observatory

View Website Favorite (8) 373 W Geneva St - Williams Bay, WI 53191
Information: 262-245-5555 x880

Check the website for a current schedule of daytime and evening program times

Known as the birthplace of modern astrophysics, Yerkes Observatory is open to the public for daytime tours Monday through Saturday and evening telescope observing programs, year round, excluding Thanksgiving, Christmas, and New Year’s Day.  Daytime tours provide a fascinating overview of 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. Evening observing tours are conducted with either the 40-inch refractor or the 24-inch reflector (mirror-type) telescopes. Check the website for a current schedule of daytime and evening program times.

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