When is Chen Bing?

Refers to 1 day and 2nd day of every ten days of the lunar calendar, namely 1 day and 2nd day, 1 1 day,12nd day and 2nd day of the lunar calendar.

According to heavenly stems and earthly branches, "A, B, C, D, E, Ji, G, Xin, Man and Ghost" is called ten days' work.

Every month is divided into three parts, 1- 10, 1 1-20, 2 1-30, with a period of ten days, and the tenth day is ten days.

The days of 1- 10,1-20, and 2 1-30 are respectively: A day, B day, C day, D day, E day, Ji day, Geng day, Xin day, Ren day, and Geng day.

Extended data:

Heavenly stems and earthly branches, the main branch for short, originated from the observation of astronomical phenomena in ancient China.

According to the method of recording the sun in ancient heavenly stems and earthly branches, the heavenly stems are divided into five elements: A and B belong to wood, A is sunny wood, and B is shady wood; C and D are fire, C is yang fire and D is yin fire; Wuji belongs to the soil, Wuji is the positive soil, Wuji is the negative soil; Geng Xin belongs to gold, Geng is, Xin is yin gold; Both nonyl and decyl belong to water, nonyl is yang water and decyl is yin water.

The 60th day of a year is roughly a cycle of 2 months; Recycle it once and then use it, recycle it once and recycle it once. According to the confirmed literature, the date of the year of trunk and branch began in February of the third year of Lu Yingong ("Food is the sky", and the fifty-first year of Zhou Pingwang was converted into February 22, 720 BC).

Compared with recording a month and a day, it is very easy to calculate the date interval of historical events and whether there is a leap month. Because the 29th or 30th of each month in the lunar calendar is uncertain, and whether there is a leap month is unknown, it will be difficult to calculate if the date crosses the month. As for the correspondence between a certain day and the main branch, you can check the perpetual calendar.

Reference source: Baidu Encyclopedia-heavenly stems and earthly branches

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