Richmond Hill David Dunlap Observatory

The David Dunlap Observatory is home to the largest optical telescope on Canadian soil with a primary mirror measuring more than 1.88 metres (74 inches) in diameter. Constructed in the 1930s, the Observatory is located in the heart of Richmond Hill, Ontario. The building is 18.6 metres (61 feet) in diameter and the rotating dome weighs 73 metric tons. The telescope itself weighs 21 metric tons (without its primary mirror).

The DDO is located at 123 Hillsview Drive in Richmond HIll. Hillsview can be reached from Bayview Avenue, north of 16th Ave.
David Dunlap Observatory 123 Hillsview Drive Richmond Hill, ON, L4C 1T3
Phone Number: 
43' 51' 46" N
79' 25' 21" W
There is plenty of parking for regular events. Parking will be restricted for major open house events.