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

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

Ambush means entering the dog days. "Summer solstice, the first fall of three Geng", this is the basis for establishing the first autumn. The almanac stipulates that "Voltages will be counted from the third day of the summer solstice", which means that "counting down from the summer solstice" and counting to the third "Geng Day" will begin to decline. 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 when it reaches three volts in about 20 days.

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 arrives in beginning of autumn is the last lie. Every Geng day is 65,438+00 days apart, and the number of mid-autumn festival days is not fixed. There are four Geng days between the summer solstice and the beginning of 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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