Info Thursday
Dog Days

On the onset of winter, I thought I'd remind us all of summer. So if you've ever heard the phrase "the dog days of summer," then you may (or may not) be interested to know that it refers to the ancient, and incorrect, belief that summer was caused by the proximity of Sirius, also known as the dog star, to the sun.

Source:
http://en.wikipedia.org/wiki/Dog_Days