How did the “dog days of summer” (starting July 3rd) enter the English language?

http://english.stackexchange.com/questions/344386/how-did-the-dog-days-of-summer-enter-the-english-language

 

The expression dog days of summer appears to derive from ancient Greek and Roman mythology according to which the star Sirius was indicative and probably responsible for the hottest days in summer:

  • The ancient Greeks noticed that summer’s most intense heat occurred during the approximate 40-day period in the early summer when Sirius, the brightest star in the sky, rose and set with the sun. To them it was simple math. The daytime addition of the warmth of Sirius—ancient Greek for “glowing” or “scorcher”—to the blaze of the sun equaled extreme heat. According to Greek mythology, Sirius was the dog of the hunter Orion, and the ancient Romans placed the star in the constellation Canis Major (Latin for “Greater Dog”). The Romans thus referred to the sweltering period when the rising of the sun and Sirius converged as the “dies caniculares” or “days of the dog star.” (www.history.com)

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