What do you mean by three volts? When did the surrender begin?

The dog days are the first, middle and last days, which is the hottest period during the Lunar New Year in China. It began to rain on the third Geng day after long summer.

The so-called "dog days" refers to the days between the two solar terms of light summer and great summer, about from mid-July to mid-August in the solar calendar. The "dog days" usually last for 30 to 40 days, and it is the day with the highest temperature, humidity and sultry weather in a year. "Crouching in the dog days" means "summer heat lurks underground"

The first and last days of a year are 10 days, and the middle days are 10 days or 20 days in different years. Chufu, also known as Fu Tou, is the day before the third Geng Day from summer to the fourth Geng Day. Late autumn, also known as late autumn, refers to the day before the first Geng Day after beginning of autumn to the second Geng Day. The second Geng day is designated as going out, that is, the end of the dog days.

Middling, also called falling, refers to the period from summer to the fourth Geng Day in the future to the day before the first Geng Day after beginning of autumn. The fourth Geng day is the first day of mid-fu, and for beginning of autumn before July of the lunar calendar, mid-fu is 10 day; For the beginning of autumn season after July of the lunar calendar, midsummer is 20 days.