David Dunlap Observatory

The David Dunlap Observatory (DDO) is a large astronomical observatory site located just north of Toronto in Richmond Hill, Ontario within a 189-acre (76 ha) estate. Formerly owned and operated by the University of Toronto from its establishment in 1935 until 2008, the observatory is now managed by the Royal Astronomical Society of Canada, Toronto Centre. 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. 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. (238 m) 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.

Read more about David Dunlap ObservatoryDDO 74 Inch (188 Cm) Telescope Contemporaries On Commissioning

Other articles related to "dunlap, david dunlap observatory, observatory":

Shoot The Moon - Cast
... Actor/Actress Role Albert Finney George Dunlap Diane Keaton Faith Dunlap Karen Allen Sandy Peter Weller Frank Henderson Dana Hill Sherry Dunlap Viveka ...
Scott R. Dunlap
... Dunlap (20 June 1892 – 30 March 1970) was an American film producer, director, screenwriter, and actor ... Dunlap produced 70 films between 1937 and 1960, and directed 47 films between 1919 and 1929 ... In 1942, Dunlap was with Western star Buck Jones at the Cocoanut Grove fire in Boston, Massachusetts ...
David Dunlap Observatory - DDO 74 Inch (188 Cm) Telescope Contemporaries On Commissioning
... Three largest telescopes in 1935 # Name / Observatory Image Aperture Altitude First Light Special advocate 1 Hooker Telescope Mount Wilson Obs. 254 cm 1742 m (5715 ft) 1917 George Ellery Hale Andrew Carnegie 2 David Dunlap Observatory 74 inch 188 cm 224 m (735 ft) 1935 Clarence Chant 3 Plaskett ...
Matthew Dunlap
... Matthew Dunlap (born November 26, 1964) is an American politician from Maine ... A Democrat, Dunlap is the Secretary of State of Maine, serving since January 7, 2013, and previously in that same post from 2005 to 2011 ...
Dunlap, Philadelphia, Pennsylvania
... The neighborhood of Dunlap is situated in present day West Philadelphia ... Dunlap is squeezed in between the neighborhoods of Mill Creek (West Philadelphia ) and Haddington ((West Philadelphia))and situated just north of Walnut Hill ((West Philadelphia)] ... The neighborhood is named after the former historic Thomas Dunlap School that was restored into senior homes in 1991 ...

Famous quotes containing the words observatory and/or david:

    Where there is an observatory and a telescope, we expect that any eyes will see new worlds at once.
    Henry David Thoreau (1817–1862)

    What avail all your scholarly accomplishments and learning, compared with wisdom and manhood? To omit his other behavior, see what a work this comparatively unread and unlettered man wrote within six weeks. Where is our professor of belles-lettres, or of logic and rhetoric, who can write so well?
    —Henry David Thoreau (1817–1862)