What is the basis for the ancients to use eight-character fortune telling? Please say it in a popular way.

Eight characters. Generally speaking, it is statistics, algebra, with a little chemistry.

People are born at different times corresponding to different five-element equations. According to the five elements of different years, you bring in the results of the previous equation. Then find out what will happen in the statistics of the ancients. This process of solving equations and checking results is eight-character fortune telling.

Why do you say there is a little chemical reaction? This is one of the conditions to be considered when solving the equation.

The eight-character is a kind of prediction that appeared only in the Tang and Song Dynasties, and it is the crystallization of ancient wisdom accumulation.