Why is Sirius A called the dog star?
Sirius A is the brightest star in the constellation Canis Major
(translates: large dog). It follows the warrior, Orion, in the night sky.
Sirius is called the dog star because it is in the constellation Canus
Major - the big dog.
Have you heard of the "dog days of summer?" Check it out. That name is
related to Sirius, also.
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Update: June 2012