How to calculate the ambush of Sangeng on the summer solstice?

On the third day of summer solstice, count three volts: July 16, which is "three volts" for 40 days.

Summer solstice. The solstice just after summer is the dog days. As the saying goes, "from the third Geng day in summer", that is to say, from the summer to the third Geng day, it has entered the initial stage, that is, the first day of prostration. Astronomical science experts said that the third "Geng Day" from the summer solstice in 2022 is July 16, which means that this day is autumn.

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Volt, marking the hottest period of the year, as the saying goes, "heat is at three volts." A member of the Chinese Astronomical Society and an expert in astronomical science in Tianjin said that the date of the volt is calculated according to the date of the branch. In ancient China, 65,438+02 words of A, B, D, E, G, N and N were called "heavenly stems", and 65,438+02 words of Zi Ugly Mao Yinchen's argument at noon were called "earthly branches".

Stem and branch are the floorboards of heavenly stems and earthly branches. The word "heavenly stem" and the word "earthly branch" are matched with each other in order, and there are 60 combinations of * *, which are often called "sixty jiazi". Branches and branches were first used to record days, and later used to record years, months and times.