The calculation method of the annual column: Tiangan+Dizhi, Tiangan and Dizhi are arranged and combined in the order of Jiazi and Ugly B, with a total of 60 arrangements and combinations, collectively called Sixty Jiazi, and one combination is changed every year. Four pillars refer to the time when a person was born, that is, year, month, day and hour. When people use "heavenly stem" and "earthly branch" to represent year, month, day and hour respectively, such as Jiazi Year, Bingyin Month, Xin Chou Day and Renyin Time.