What is the birth character in ancient times?

Anciently known as the Eight Characters of the Birthday is based on the three elements of a person's birth date, time and place of birth, which are transformed into four groups of heavenly stems and earthly branches. The eight characters are also called four pillars. A column corresponds to a group of stems and branches.

For example: a woman was born at 14:01 on August 23, 1986 in Linli County, Changde City, Hunan Province, using the online tool to find out his eight-character birth chart is: C Yin C Shen He Hai Xin Wei.