When did the dog days of summer begin?

1, the dog days are the first day of the third Geng Day after the summer solar term every year, and summer is the third Geng Day. The temperature is three volts. The dog days mark the hottest period of the year. Voltage is divided into initial voltage, intermediate voltage and final voltage, collectively referred to as three volts. The dog days are as short as thirty days, every ten days, and as long as forty days, ten days in the morning, ten days in the evening and twenty days in the middle. The dog days are the hottest time of the year, usually after the heat and before the heat. There are ways to specify the number of specific algorithms.

2, Xia San Geng number, Fu Fu Li Qiu see Geng number. That is to say, let's talk about solar terms first, then see when to pay the solar terms from summer solstice, and then arrange the date. From the summer solstice, we can count the boxer, the first boxer, the second boxer and the third boxer. After the summer, we can see the third boxer. Even if it falls, the dog days will be counted from this day, which is the first day of the first prostration. There are ten dry, the first ten days, even if you see the fourth Geng, you will enter the middle. Going to beginning of autumn to see the first Japanese genus of Geng entered the final stage. Ten days ahead, ten days behind. There are ten days in the middle and twenty days in the middle. Xia Hou, see Geng early, two Geng in the middle of twenty days, and see Geng later. The sixth Geng is the beginning of the first Geng in autumn, with only ten days in the middle.