Heavenly stems and earthly branches and the Five Elements: The five elements in the eight characters are mainly divided into ten heavenly stems and twelve earthly branches, which is a theory formed by ancient people's understanding and exploration of the world and has the limitations of the times.
Tiangan: Jiamu, Yimu, Ding Huo, Wuji soil, Geng Xin gold and Renshui.
Ground branches: wood, Jiawu fire, ugly earth, gold, Haizishui.
Example: The current time is converted to eight characters.
AD: Monday, 201May 1 1 0: 27.
Constellation: Taurus
Lunar calendar: March 23, B.
Eight characters: Xin April when Ding Hai was a boxer in the last year of B.
Five elements: wood, earth, gold, fire, water, gold and water.