How many days after summer solstice, how to calculate the voltage?

After beginning of autumn, it dropped for 20 days, and before beginning of autumn, it began to drop for 30 days, about from summer to the future 10 days.

An ambush is entering the dog days. "On the summer solstice, the head of the three gengzi falls", which is the basis for establishing the first autumn. The almanac stipulates that "the number of volts starts from the third day of summer", that is to say, "it starts to count down from summer" and begins to fall on the third "Geng Day". The "Geng Day" here refers to the days prefixed with "Geng" in the ancient "Ganzhi Jiri Law".

Extended data

Voltage is divided into initial voltage, intermediate voltage and final voltage, which is called three volts. The dog days are the hottest period of the year, because the nights are getting shorter and shorter, the days are getting longer and longer, and the sunshine is close to direct sunlight. But the summer solstice is not the hottest time, because at this time, a large part of the heat absorbed by the ground radiates at night. But it absorbs more heat and dissipates less heat every day, and it gets hotter every day. It will be the hottest in about 20 days to three volts.

The date of the dog days is from the summer solstice to the third Geng Day, which is the first lie, the fourth Geng Day to the fifth Geng Day is the middle lie, and the second Geng Day after the first Geng Day to beginning of autumn is the last lie. Every Geng day is 65,438+00 days apart, and the number of mid-festival days is not fixed. There are four Geng days from summer solstice to autumn, with 65,438+00 days in the middle, five Geng days and 20 days in the middle.

V means summer. From the summer solstice, the days begin to get shorter and the nights begin to get longer. There is a cold factor lurking in the middle of heat, so it is very scientific to name it "Fu".

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