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 luck, and three 20 years were three luck, forming one yuan. Sanyuan Games are Shangyuan, Zhongyuan and Xia Yuan, and each Yuan has three games, which are collectively called "Sanyuan Jiu Games". Shangyuan is the first, second and third luck; The Central Plains is the fourth, fifth and sixth luck; The next dollar is the seventh, eighth and ninth luck. 60 years 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 the same 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 and distributed in a small sector, forming a "nine-star connection". Since the motion law of this celestial body will never change, astronomers have defined the time system of "three elements and nine fortunes" according to this law, with 180 as the positive element, and each positive element is divided into three elements: upper, middle and lower. Every 60 years, each element is divided into three fortunes, that is, one to nine fortunes.

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

Extended data

Now the latest "ternary nine-field table" is listed:

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

Fourth Bureau 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)

Eighth national games from 2004 to 2023 (from Shen Jianian to Gui Mao)

The 9th National Games (Chen Jia to Guiyang)

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