The dog days of summer is a common expression, though not everyone knows where the saying originated. It is an astrological/astronomical reference to the fixed star Sirius, aka the “dog star” located in the Canis Major constellation. Sirius is a fixed star in the Western tropical zodiac sign of Cancer, and experiences its heliacal rising (aka becomes most visible on the eastern horizon just before sunrise) during Cancer season.
Many old farmers almanacs will list the dog days as being from July 3rd to August 11th, with Sirius making its big appearance around July 19th. However, the days leading up to Sirius’ heliacal rising were usually considered to be the sultriest. As Sirius is the brightest star in the night sky,