How to calculate the ambush of Xia in the middle of the night

Calculating the first day of the summer solstice is one of the methods for calculating the third day of the summer solstice in China lunar calendar, which means that the third day of the summer solstice is the first day of the first day.

In ancient heavenly stems and earthly branches, the word "Geng" in the three gengzi was the seventh word in the ten days of "A, B, C, D, E, Ji, G, Xin, Ren and Gui", which was repeated every 10 day.

According to this formula, we can calculate the lodging time every year.

Xiazhiziban

How to calculate the autumn of Xia San Geng?

According to the almanac, "the number of volts will fall on the third day of the summer solstice", that is to say, from the third day of the summer solstice, Geng Yin began to fall asleep and lasted for 10 days.

The "Geng Day" here refers to the days prefixed with "Geng" in the ancient "Ganzhi Jiri Law". The almanac also stipulates that the first "Geng Day" after the solar term "beginning of autumn" is the day when the last volt begins.

The "dog days" are determined according to the "laws of solar terms" in ancient China. Every summer to the future, the third Geng Day (referring to the day when the word "Geng" appears in the main branch year) is the first Geng Day, the fourth Geng Day is the middle one, and the first Geng Day after beginning of autumn is the last one. Together, it is called the third volt.

Flowers, plants, flowers, flowers, flowers in full bloom-

As the saying goes, "It's hot in dog days." According to our traditional calendar, today we entered the hottest dog days in summer.

Three volts refers to three consecutive periods: the first, the second and the last. The third Geng Day after long summer is the beginning of the first summer, the fourth Geng Day is the beginning of the middle summer, and the first Geng Day after beginning of autumn is the beginning of the last summer, which lasts 10 day, but in some years, the middle summer lasts for 20 days, such as this year.

Generally speaking, the average temperature is the highest in dog days.