History of the David Dunlap Observatory

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Richmond Hill Public Library - Central Library

1 Atkinson Street

Richmond Hill, ON L4C 0H5

Canada

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One of the City of Richmond Hill's most fascinating and unique historical sites is the David Dunlap Observatory (DDO), home of the largest telescope in Canada. The University of Toronto constructed the Observatory on the former farmstead owned by Alexander Marsh. It included a dome, housing a 74-inch (1.88m) reflector telescope, and an Administration Building, with three smaller telescope domes. When completed in 1935, the main telescope was the second largest in the world and the largest in Canada.

The City of Richmond Hill’s Heritage Services Coordinator Maggie Mackenzie joins us to talk about the history of the Observatory.

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Richmond Hill Public Library - Central Library

1 Atkinson Street

Richmond Hill, ON L4C 0H5

Canada

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