Join us for a special Lunar Eclipse open house on Tuesday, September 17 from 8pm – 10pm! We’ll have lunar eclipse observing outside with the Northwest Suburban Astronomers if the weather is clear, family activities, presentations from Yerkes astronomers, food for purchase from local vendors, and more for your family to enjoy. 

The open house will take place rain or shine. This does not include use of telescopes within the building. Reservations are required, and tickets can be purchased on our ticketing website. Tickets for this event cost $5 per child and $10 for adults and are available online only. There will not be parking onsite at the Observatory. Ticket holders must park at Williams Bay School and board an accessible trolley that will run a continuous shuttle between the school and observatory during the Open House. Scroll to see the full schedule of events!

To reserve tickets, click here to go to our ticketing website!