The Ninth National Games in Yuan Dynasty was a time division method in China. The ancients divided 20 years into one and three 20 years into three, 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. It has been recorded in the Yellow Calendar since ancient times and used in combination with the dry calendar, which is mostly used for geomantic omen.
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. At the same time, the operation law of Beidou plus the left satellite and the right satellite coincides with the natural phenomena and the good or bad luck of people on the earth, and one plays a leading role every 20 years.
Laws of nature:
Ancient scientists in China observed that Saturn and Jupiter met once every twenty years, in a straight line. When civil engineering meets, some major geological disasters and natural disasters often occur on the earth, and people's behavior will also have some obvious abnormal reactions.
It is also found that Saturn, Jupiter and Mercury will meet in a straight line every 60 years, and the nine planets in the solar system will be on the same side of the sun every 180 years, forming a grand gathering of the nine planets, which ancient astronomers called "nine-star alignment".
This celestial body goes round and round and never changes. The ancients knew this opportunity well and established the system of "Three Yuan and Nine Games" to divide the time: 180 was taken as a positive element, and each positive element was divided into Shangyuan, Zhongyuan and Xia Yuan; Every 60 years, it will be shipped in three times, each for 20 years, that is, the first, second and third shipments of Shangyuan, the fourth, fifth and sixth shipments of Zhongyuan and the seventh, eighth and ninth shipments of Xiayuan.