Which solar term did the dog days start from?

① First onset: July 16 to July 25, *** 10;

② Medium pressure: July 26th to August 14, ***20 days;

③ Terminal voltage: August 15 to August 24 *** 10.

There are 40 dog days in 2022. Three volts is between hot summer and summer solar terms. The first stay (also called Fu Tou) this year is from July 16 to July 25th, and the last stay (also called Sanfu) is from August 15 to August 24th.

Generally speaking, the average temperature of "three volts" is the highest. This season, many places in the country will start the "steaming and baking" mode, and the public should do a good job in heatstroke prevention and cooling.

Date calculation

Three days, one volt is ten days, according to heaven for ten days. Therefore, the dog days are divided into three days, that is, the third dry day after the summer solstice, that is, the first day of Geng Day.

For example, the summer solstice in 2006 is June 2 1 in the western calendar year, and the first day of this day is a new day. 28 days later is the third Geng day, so July 20, 2006 is the beginning of the first volt. Ten days later, it was another Geng day, that is, July 30, and it entered the second volt.

Ten days later, another Geng Day, the first Geng Day after beginning of autumn, that is, August 9, entered the dog days; If it is 2007, July 15 is the third Geng day and the beginning of the first volt. Ten days later, it was another Geng day, that is, July 25, and it entered the second volt (middle volt).

Ten days later, it was another watch, but we haven't arrived in beginning of autumn yet. Ten days later (there are still 20 days in the middle of this year), it will be another Geng Day. The first Geng Day after beginning of autumn, that is, August 14, will enter the dog days.

That is to say, it is very hot after the dog days every year, especially in the ten days (sometimes twenty days) in midsummer, which is the hottest. There is a folk saying that "Sanjiu is cold and Sanjiu is hot".