David Dunlap Observatory
David Dunlap Observatory, Astronomical observatory and national historic site in Richmond Hill, Canada
The David Dunlap Observatory features a 74-inch reflector telescope, which remains the largest telescope permanently installed in Canada at present.
The observatory opened its doors in 1935 through the efforts of Clarence Chant and the financial support of David Dunlap's widow.
Scientists at the observatory provided the first direct evidence that Cygnus X-1 contained a black hole, marking a breakthrough in astronomical research.
The facility operates public viewing sessions with telescopes, allowing visitors to observe planets, stars, and other celestial objects throughout the year.
The observatory building appears in television productions, including NBC's Hannibal and Netflix's The Umbrella Academy, due to its architectural features.
Location: Richmond Hill
Inception: 1935
Official opening: May 31, 1935
Elevation above the sea: 224 m
Address: 123 Hillsview Drive
Website: http://astro.utoronto.ca/DDO
GPS coordinates: 43.86300,-79.42270
Latest update: May 14, 2025 11:57
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