What does Geng Xu mean?

Geng Xu: It is the eight characters, and the eight-character numerology began in the Tang Dynasty. At the beginning, it was based on the annotation of the year, with the life of the year as the life, supplemented by the phonetic notation. In the Tang Dynasty, Li changed it to year-based and used four pillars: year, month, day and hour. 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 Ziping method, so the eight-character numerology is also called Ziping method or the twelve "eight-characters" of Ziping eight-character study are also called four pillars (year pillar, moon pillar, sun pillar and time pillar), and each pillar has two characters, with heavenly stems (A, B, C, D, E, Ji and G) at the top.