What is the first day of the summer heat in 2022?

July 16, 2022, also the first day, is the dog days. The specific time is as follows:

Initial period: from July 6, 2022 to July 25, 2022, with a total of 10 days.

Zhongfu: July 26-August 2022 14, totally 20 days.

Terminal: from August 5, 2022 to August 24, 2022, totaling 10 days.

Summer high temperature algorithm

In the lunar calendar used in China, there is a kind of "branch calendar", which uses the characters of "heavenly stem" (A, B, C, D, E, G, Xin, Ren and Gui) and "earthly branch" (Zi, Ugly, Yin, Mao, Chen, Si and Wu) 10.

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

Because the "dry branch" calendar is rarely marked in the current calendar, it is generally impossible to see which day is "Geng Day", which requires people to inquire about the old imperial calendar. Therefore, the traditional method of calculating the dog days starts from the summer solstice, and the third Geng day is the first day according to the arrangement of the dry and branch days. The fourth Geng Day was in the middle, and the first Geng Day after beginning of autumn was the last.