How many days is the third day of the solstice?

The summer of solstice is midnight, and ten days is a watch.

The so-called "Gengri" is a way for people to mark the date with heavenly stems and earthly branches, which is similar to the heavenly stems and earthly branches Chronology. Geng is one of the 65,438+00 days, and the date beginning with Geng is Geng Day, such as Geng Yin Day, which is just 65,438+00 days away from the next Geng Day.

"Sanfu" has a long history, which can be traced back to the Qin and Han Dynasties. From BC 1976 to the present, the method of "recording Japanese branches" has been popular in China, that is, taking A, B, D, E, G, N _；; Yin, the son of Dizhi, applied for a letter at noon. Each of them took a word combination and got 60 different names, such as Jia Zi, Yi Chou and Bing Yin, to record the date. Every day with the word "Geng" is called "Geng Day".

"In the summer of the third year of solstice, several heads fell" is an empirical statement for people to calculate "falling into an ambush", which means that Xia Hou's third "Geng Day" is the day of falling into an ambush.

In addition, the fourth "Geng Day" is defined as "Zhong" and the first Geng Day after beginning of autumn is defined as "Final". The first day and the last day are ten days, and the time in between is not fixed. Some days in between are 20 days.