In ancient times, how did heavenly stems and earthly branches record the month, day and time?

Heavenly stems and earthly branches, referred to as Ganzhi for short, is used to arrange year numbers and dates in the lunar calendar, including ten-day Ganzhi and twelve Ganzhi. Heavenly stems and earthly branches Chronology Law was promulgated by the government in the form of naming the whole country from Yuan Dynasty to the second year of the Eastern Han Dynasty (that is, AD 85), and it has continued to this day, and it is an important part of China traditional culture.

Tiangan: A, B, C, D, E, Ji, G, Xin, Ren and Gui.

Dizhi: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai.

Heavenly stems and earthly branches is also divided into yin and yang: A, C, E, G, and N are yang stems, while B, D, G, and B are yin stems; Zi, Yin, Chen, Wu, Shen and Xu are the Yang branches, while Ugliness, Mao, Si, Wei, You and Hai are the Yin branches. There are sixty kinds of heavenly stems and earthly branches combinations, which are called "Sixty Jia Zi". In ancient times, Chinese people began to recycle calendar year, calendar month, calendar day and calendar year by year.

Extended data

Heavenly stems and earthly branches is one of the ancient traditional cultures of the Chinese nation. There are ten characters in heavenly stems, and the order is A, B, C, D, E, G, Xin, Ren and Gui, while there are twelve characters in earthly branches, and the order is Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen and You.

The knowledge handed down from ancient times tells people that heavenly stems and earthly branches has a very close relationship with Yin-Yang and Five Elements. There are yin-yang classification and five-element classification of the twelve branches of the Ten-day trunk, and the specific classification is divided into:

The heavenly stems are divided into yin and yang: A, C, E, G and Ren belong to Yang, which shows that they all have the yang nature of growth, exuberance and strength;

B, D, J, Xin and Gui belong to Yin, indicating that they all have the negative characteristics of reduction, decline and atrophy.

The heavenly stems are divided into five elements: A and B belong to wood, A is yang wood, and B is yin 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.

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