BaZi ("eight characters"), also called the Four Pillars of Destiny, is one of the most widely used systems in Chinese metaphysics. The year, month, day and hour of birth are each converted into a pair of Heavenly Stem and Earthly Branch — four pairs, eight characters.
The system matured during the Tang and Song dynasties: Li Xuzhong worked from year, month and day, and Xu Ziping added the hour pillar and centred the reading on the Day Stem — the "Ziping method" still used today. Classics such as Yuan Hai Zi Ping, San Ming Tong Hui, Di Tian Sui and Zi Ping Zhen Quan form its theoretical base.
Charting is only the first step. A practitioner looks at the balance and interplay of the Five Elements, the strength of the Day Master and the pattern of the Ten Gods, then layers in the ten-year luck cycles and annual influences. bazitao treats this as a traditional lens for self-reflection, not a verdict on fate.