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Sirius. in the constellation, Canis Major, is the brightest star in the night sky (apparent magnitude -1.42).

The apparent magnitude (m) of a celestial object is a number that measures its brightness as seen by an observer on Earth. The brighter an object appears, the lower its magnitude value (i.e. inverse relation). The Sun, at apparent magnitude of −27, is the brightest object in the sky. view more...