The origin of the eight characters? Who invented it?

The eight-character numerology was first seen in Huangdi Neijing. At that time, people only knew how to infer human diseases by the time of birth. Later, people gradually discovered that this method can also be used in other aspects. After thousands of years of inheritance and reform, in the Ming and Qing Dynasties, the eight-character prediction became more and more perfect. In the Five Dynasties, Xu Ziping changed to Japanese occupation as my (Japanese master), focusing on the restraint of the five elements between the four pillars and the encounter between punishment and punishment, and carried it forward. Today's eight-character divination is based on the Ziping method, so the eight-character numerology is also called Ziping method or Ziping eight-character study. It is said that during the Yellow Emperor's period, China's calendar (now the lunar calendar) was made by the Emperor's family and Fu. Since the era of the Yellow Emperor, there have been 78 flowers and 68 flowers. A 60-year-old flower is composed of heavenly stems and earthly branches arranged in turn and combined circularly.