What's a head?

It refers to the third Geng day, that is, the first day of dog days.

Fu Tou, also known as Chu Fu, is a statement about the calendar. Chufu refers to the third Geng day from summer to the future, that is, the first day of dog days. It usually refers to the period from summer to the third Geng day in the future to the day before the fourth Geng day.

According to China's calendar, this is the beginning of a real summer. The initial lodging is fixed at 10 day, and lodging begins from summer to the third Geng day in the future, which is called lodging.

According to China's calendar, the first day is the beginning of a real summer. The first autumn is usually the third Geng day from summer to the future, which is the first day of dog days, also called "the first autumn".