David Dunlap Observatory
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High Quality Content by WIKIPEDIA articles! The David Dunlap Observatory is a large astronomical observatory site once owned by the University of Toronto, located just north of the city in Richmond Hill, Ontario within a 189-acre park. Its primary instrument is a 74-inch reflector telescope, at one time the second largest telescope in the world, and still the largest in Canada. Several other telescopes are also located at the site, which formerly included a small radio telescope as well. Located on a hill, yet still relatively close to sea level at 730 ft. above sea level, and now surrounded…mehr

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High Quality Content by WIKIPEDIA articles! The David Dunlap Observatory is a large astronomical observatory site once owned by the University of Toronto, located just north of the city in Richmond Hill, Ontario within a 189-acre park. Its primary instrument is a 74-inch reflector telescope, at one time the second largest telescope in the world, and still the largest in Canada. Several other telescopes are also located at the site, which formerly included a small radio telescope as well. Located on a hill, yet still relatively close to sea level at 730 ft. above sea level, and now surrounded by subdivisions, optical astronomy ability has been reduced as compared to other remote observatory sites around the world. Nevertheless, the DDO can still be used for spectral astronomy and is the site of a number of important studies, including pioneering measurements of the distance to globular clusters, providing the first direct evidence that Cygnus X-1 was a black hole, and the discovery that Polaris was stabilizing and appeared to be "falling out" of the Cepheid variable category.