David Dunlap Observatory

Several other telescopes are also located at the site, which formerly also included a small radio telescope. Its primary instrument is a 74-inch (1.88 m) reflector telescope, at one time the second-largest telescope in the world, and still the largest in Canada. The David Dunlap Observatory (DDO) is an astronomical observatory site in Richmond Hill , Ontario, Canada. Established in 1935, it was owned and operated by the University of Toronto until 2008. The scientific legacy of the David Dunlap Observatory continues in the Dunlap Institute for Astronomy & Astrophysics, a research institute at the University of Toronto established in 2008. It was then acquired by the city of Richmond Hill , which provides a combination of heritage preservation, unique recreation opportunities and a celebration of the astronomical history of the site. The telescope was driven by the vision of astronomer Clarence Chant, shared by businessman David Alexander Dunlap – whose family provided financial support after Dunlap's death in 1924.