The University of Chicago

373 W. Geneva St, Williams Bay WI 53191 (Latitude 42 34.2, Longitude -88 33.4)
Look Through a Large Telescope at the Moon, Jupiter, Stars and More at Yerkes Observatory!
Throughout the seasons, the evening sky changes slowly and reveals many different celestial wonders visible with and without optical aid. Every month during the year, on some weekday and weekend evenings, Yerkes Observatory offers observing sessions with our 24-inch diameter reflecting telescope, weather permitting, for participants who are age 10 and up.

The remaining public observing dates for April 2014 are the 27th, 28th, 29th and 30th.
Programs begin promptly at 8:30 pm. Please plan to arrive at the Observatory by 8:15 pm.

MAY dates will appear here toward the last week in April.

The cost to participate is $25 per person, payable the evening of the event.   Each session is limited to 10 participants and lasts approximately two hours.  Reservations are required and can be made by email at, or by calling 262-622-2368. Please include your email address and cell phone number. Participants must be physically fit and able to climb 40 steep, winding stairs from the ground floor of the building to the observing dome of the 24-inch reflector. The dome is not heated and guests are encouraged to dress for possible cool temperatures on spring evenings. Sensible shoes are required (no high heels, flip flops, open-toed sandals, etc.).

We begin each program with a brief introduction to the night sky with the unaided eye. Binoculars can help to enhance your stargazing experience at Yerkes, but are not necessary. From the dark sky environment at Yerkes you may see superb views of planets, constellations, hundreds of stars, an occasional meteor, the Milky Way and artificial satellites.

Programs are subject to cancellation due to adverse weather conditions including cloudy skies, rain or high winds.

For information about regularly scheduled Saturday tours, weekday tours, and other events, please click here.