The dog days of summer are upon us, and you might think that they have something to do with hot and humid weather. Well, that isn’t exactly where the term originated from. The dog days of summer are actually July 3rd through August 11th.
The Heat of 2 stars?
Those days are the 20 days before and 20 days after the “Dog” star Sirius rises and falls in conjunction with the sun. Sirius is the brightest star in the constellations Canis Major. The ancient Romans believed that its heat added to the heat of the sun, creating a stretch of hot and humid weather. During the time between July and August, the “dog” star rising with our sun made the ancients think the heat of two stars where making us hotter. In modern times we know that there is no heat generated from this very distant start, but the term stuck. So even in modern times, we consider the hot and muggy time of the summer between late July and mid-August as the dog days of summer.