How are Shang Yuan Jia Zi, Zhong Yuan Jia Zi and Xia Yuan Jia Zi divided? When does the calculation start?

The ancients divided 20 years into one fortune, and three 20 years were three fortunes, forming one yuan. The ternary games are Shangyuan, Zhongyuan and Xia Yuan, and each yuan has three games, which are collectively called "Sanyuan Nine Games". Shangyuan is the first, second and third luck; The Central Plains is the fourth, fifth and sixth luck; The next yuan is the seventh, eighth and ninth luck. 60-year delivery per yuan, 3 yuan total 180 years.

Among the nine planets in the solar system, Saturn and Jupiter meet once every 20 years and are in a straight line; Saturn, Jupiter and Mercury will meet once every 60 years. Every 180 years, the nine planets will be on the same side of the sun, distributed in a small fan shape, forming a "nine-star connection". Because the law of motion of this celestial body will never change, astronomers define the time system of "three yuan and nine luck" according to this law, with 180 as the positive element, and each positive element is divided into upper, middle and lower three yuan, each for 60 years, and each element is divided into three luck, that is, one to nine luck.

The algorithm first began in the era of the Yellow Emperor.

Extended data

Now list the recent "three yuan nine games table":

Shangyuan

Yi Yun 1864- 1883 (from Jiazi year to Guiwei year)

1884- 1903 (from Shen Jia to Gui Mao)

Sanyun 1904- 1923 (Chen Jia to Guihai)

Satoshi Nakamoto

Yun Si 1924- 1943 (from Jiazi year to Guiwei year)

1944- 1963 (from Shen Jia to Gui Mao)

Liu Yun 1964- 1983 (Chen Jia to Guihai)

Xia Yuan

Yun Qi 1984-2003 (from Jiazi year to Guiwei year)

The 8th National Games 2004-2023 (from Shen Jianian to Guimao)

The 9th National Games (Chen Jiazhi Guihai)

Note: The above Gregorian calendar years and the trunk and branch calendars only correspond roughly, and the starting points of Gregorian calendar and trunk and branch calendar are different.

Baidu encyclopedia-sanyuan jiuyun

Baidu Encyclopedia-Jiazi Chronology