What do you mean by front, middle and back?

1, initial accommodation

The first autumn is from the third Geng day to the day before the fourth Geng day. The initial lodging time is 10 day, and the weather gets hotter every day after the initial lodging.

2. Number of columns

Middling refers to the day before the fourth Geng Day from summer to the first Geng Day after beginning of autumn. There are long and short periods of falling, some years are 10 days, and some years are 20 days, which mainly depends on the date of the third Geng day (the first falling) after the summer solstice solar term.

3. The last volt

The first stage is from the first Geng Day after beginning of autumn to the day before the second Geng Day after beginning of autumn, that is, 10 day. The last volt is the last volt of the dog days. It's cooler in the morning and evening, but the sun is still strong during the day.

Dog days:

Three volts, the initial, middle and final volts, is the hottest season of the year. The dog days appear in the Gregorian calendar from mid-July to mid-August every year, and its climatic characteristics are high temperature, low pressure, high humidity and low wind speed. The dog days, which appear between the summer heat and the summer heat, are the period with the highest temperature, the highest humidity and the most severe sultry heat in a year. Three volts can be divided into initial volts, intermediate volts and final volts, and their dates are determined by the coordination of solar terms and solar terms in the dry branch calendar. After "entering the volt", many places in the country will enter the continuous high temperature mode.