In 218, what year should it be calculated by the chronological method?

The year of 218 is calculated by the trunk and branch chronology method, and January 1, 218-February 3, 218 is the year of the rooster; February 4, 218-December 31, 218 is the Lunar New Year, the Year of the Dog. Extended information

The legend of the chronology of the trunk and branch comes from the era of the Yellow Emperor. Actually, it sprouted in the early Western Han Dynasty, started in Wang Mang, and passed 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 the year of the year, and the year of the year is a real celestial body, so the year of the year is used, and the branches represent the twelve days (dividing the day around the ecliptic into twelve equal parts). Jupiter orbits the sky once a week in 11.862, so the year-old star passes by once in about 85 years, which is called "Chaochen" (proposed by Liu Xin).

At this time, the chronology of cadres and branches is also used. In the Zhuan Xu calendar, the first year of Emperor Taizhu of the Western Han Dynasty (the first 14 years) was Tai Sui in Bingzi, and taichu calendar changed it to Ding Chou by the super-Chen method. At the end of the Han Dynasty, Liu Xin's newly edited San Tong Calendar changed the first year of Tai Chu to C Zi, and the second year of Tai Shi (the first 95 years) from Yi You to C Xu. From this, we can see that there is some confusion in the transition between the years of the cadres and the branches in the Western Han Dynasty and the years of Tai Sui. By the Eastern Han Dynasty, calendar scholars did not use the super-Chen method. Therefore, the Taizi chronology and the Ganzhi chronology are the same on the surface in the second year of Taishi.

in the second year of Emperor Yuanhe of the Han Dynasty (AD 85), the imperial court ordered the implementation of the Ganzhi Chronology throughout the country. Since then, the chronology of the main branches has been fixed and has continued to this day without confusion. However, the expression of using heavenly stems and earthly branches to match the date originated in Xia Dynasty, followed by Shang and Zhou Dynasties, and 6 pieces of bovine bones were found in the archaeological site of Shang Dynasty in Yin Ruins.

Reference: Baidu Encyclopedia-Chronology of Ganzhi.