20 18 trunk and branch chronology should be counted as which year?

20 18 is calculated by the method of trunk and branch chronology, and February 3 of 201812018 is the lunar year of the rooster; 2065438+08-2065438+081231is the year of the dog in China lunar calendar.

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The legend of the chronology of cadres and branches comes from the era of the Yellow Emperor. In fact, it sprouted in the early years of the Western Han Dynasty, began with Wang Mang and spread after the Eastern Han Dynasty. Some people think that China used dry branches to record the years before Emperor Wu of the Han Dynasty. However, this is a year in a year, and a year in a year is a real celestial body, so use a year in a year, and the branch represents twelve days (dividing the day around the ecliptic into twelve equal parts). Jupiter 1 1.862 revolves around the sky once a week, so a year-old star passes once every 85 years, which is called "Chaochen" (proposed by Liu Xin).

At this time, the chronology of cadres and branches is also used. In Zhuan Xu Calendar, the first year of Tai Chu (before 104) of Emperor Wudi of the Western Han Dynasty was Prince Bingzi, and taichu calendar changed the ugliness by surpassing the old law. At the end of the Han Dynasty, Liu Xin changed the first year of Taishu to Bingzi, and the second year of Taishi (the first 95 years) from Yiyou to Bingxu. It can be seen that the transition between the year of Ganzhi and the year of Taizi in the Western Han Dynasty was somewhat chaotic. By the Eastern Han Dynasty, calendar scholars no longer had to go beyond the traditional method. Therefore, the chronology of Prince Taishigong's two years is the same as that of Ganzhi.

In the second year of Emperor Yuanhe of the Han and Yuan Dynasties (AD 85), the court ordered the nationwide implementation of the chronicle of cadres. Since then, the chronology of the main branches has been fixed and has continued to this day without confusion. However, the expression of heavenly stems and earthly branches dating originated in Xia Dynasty, followed by Shang and Zhou Dynasties, and 60 cattle bones were found in the archaeological site of Shang Dynasty in Yin Ruins.

References:

Baidu encyclopedia-branch chronology