1, initial lodging: the initial lodging is the period from the third Geng day after the summer solstice to the day before the fourth Geng day after the summer solstice. The initial lodging time is 10 day, and the weather is getting hotter every day after entering the initial lodging.

2. Midnight: Midnight is the period from the fourth Geng Day after the summer solstice to the day before the first Geng Day after beginning of autumn. The mid-lodging time is long and short, some years are 10 days, and some years are 20 days, which mainly depends on the date of the third Geng day (first lodging) after the summer solstice.

3. Terminal lodging: The terminal lodging is the period from the first Geng Day after beginning of autumn to the day before the second Geng Day after beginning of autumn, which is 10 day like the initial lodging. The last volt is the last volt in the dog days. It is cooler in the morning and evening, but the sunshine is still intense during the day.