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Canis Major
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Canis Major

constellation
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Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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Latin:
“Greater Dog”
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Canis Major, constellation in the southern sky, at about 7 hours right ascension and 20° south in declination. The brightest star in Canis Major is Sirius, the brightest star in the sky and the fifth nearest to Earth, at a distance of 8.6 light-years. This constellation is also home to the Canis Major Dwarf Galaxy, which at a distance of 25,000 light-years is the closest galaxy to Earth. Because of its proximity to Orion, the constellation was identified as one of Orion’s hunting dogs. Canis Major was also thought to represent other dogs in Greek mythology, such as one of the hounds of Actaeon.

Erik Gregersen