TIL that the phrase "dog days of summer" is millennia old and refers to the star Alpha *Canis* Majoris (aka Sirius) appearing in the sky in July

https://en.wikipedia.org/wiki/Sirius#Observational_history

https://www.reddit.com/r/todayilearned/comments/15lohph/til_that_the_phrase_dog_days_of_summer_is/