Which solar term does counting volts start from?

The stay during the Dog Days starts from the summer solstice. 2. According to the traditional almanac, "the summer solstice falls on the third day", which means that it begins to fall on the third day of the summer solstice. The day of the summer solstice refers to the dog days prefixed with "geng" in the "Zhizhi Chronicle". It occurs between summer and summer and is the highest, most humid and sultry time of the year. The Three Volts are divided into the early, middle and last Three Volts, and their dates are determined by the coordination between the solar terms in the Ganzhi Calendar and the dates in the Ganzhi Calendar. After the "fall", many parts of the country will enter a sustained high temperature mode. [3] [6] According to the traditional almanac, "the summer solstice falls on the third Geng day", which means counting down from the summer solstice, the third Geng day begins to set. The "Geng day" here refers to the days prefixed with "Geng" in the ancient "Gangzhi Auspicious Day Law". "Fu" means that Yin Qi was forced to hide underground by Yang Qi; it also means that the weather is too hot and cannot move. [4] [12] The length of midsummer is mainly due to the difference between midsummer and midsummer. Because the third Geng Day (the first autumn) after the summer solstice occurs at different times every year, the number of days in the first autumn is also different. The time of midsummer may be long or short, it may be 10 days or 20 days. So there are two situations: some years 30 days, some years 40 days. [7-8