The Dearborn Observatory is open for public viewing every Friday night from 9 to 11 pm during the spring and summer months. The sessions are free and open to all. Reservations are required for the first hour but walk-ins are welcome in the second hour.  All visitors should note that the dome is neither heated nor air-conditioned so please dress appropriately. Friday evening sessions are held “rain or shine.”  Unfortunately, the Dearborn is NOT ADA-accessible. Several staircases must be climbed in order to reach the telescope.  For more information, or to make a reservation, please call (847) 491-7650.