命理学也称四柱又称八字，是指人出生的时间，即年、月、日、时。在人用天干和地支各出一字相配合分别来表示年、月、日、时，如甲子年、丙午月、辛丑日、壬寅时等，每柱两字，四柱共八字，所以四柱预测又称“批八字”、“测八字”、也叫四柱推命。依照天干、地支沂涵阴阳五行属性之相生、相克的关系，推测人的体咎祸福。

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The arrangement of the Universiade is as follows: male yang and female yin are arranged in order, male yin and female yin are arranged in reverse, generally arranged in eight steps, based on the main branch of the lunar column. For example, in the year of Jiashen, if a male is born in the month of Bingzi, he is born in the year of Yang. Based on Bingzi, the Universiade is arranged in order, with the major events being Ding Chou, Wu Yin, Ji Mao, Geng Chen, Xin Si, Ren Wu, Gui Wei, and Jia Shen; If a daughter is born in the third month of the year of Jiashen, she will be born in the year of Yang. Based on the third month, the major events will be ranked in reverse, with the major events being: Yihai, Jiaxu, Guiyou, Renshen, Xinwei, Gengwu, Jisi, and Wuchen. Starting number: The method of starting a large number is based on three days being equivalent to one year, that is, one day is equivalent to four months, and one hour is equivalent to five days.

The so-called 'big luck' refers to which stage in life one is lucky and which stage one does not go through. The two words fate are often used together by people, but they can also be explained separately. The life of a person is mainly reflected in their birth chart; The various stages of one's life are mainly reflected in the great fortune calculated based on the Eight Characters. According to fortune tellers, luck is very important for a person. Although a person's birth chart is good, they have always been unlucky; Some people, although born with average or even broken birth chart, often face adversity, but they can still encounter one or two good luck and achieve earth shattering careers. The good or bad fortune of a person's life is ever-changing and difficult to discern.