David Dunlap Observatory

Established in 1935 in Richmond Hill, Ontario, the David Dunlap Observatory grew from Clarence Chant’s campaign to secure a major research telescope for the University of Toronto, with crucial backing from the Dunlap family as a memorial to David Alexander Dunlap. Built around a 74-inch reflecting telescope that was then the world’s second largest and remains Canada’s largest, it became a leading center for Canadian astronomy. Research there advanced knowledge of globular cluster distances, produced the first direct evidence that Cygnus X-1 was a black hole in 1971, and contributed to observations of Polaris. Though urban growth reduced its value for optical astronomy, its scientific and heritage importance endures.

Ontario · Canada