Ancient chronology: branch chronology, chronology, chronology, branch usage, chronology, ecliptic chronology, East Pole salmon chronology, Chinese and Western composite chronology, ancient Egyptian calendar.

Chronology of cadres and branches is one of the most basic ways of chronology in ancient China. The earliest records can be found in Tian Zi Xun in Huainan, but this method was not popular in the Western Han Dynasty. Since the 30th year of Jianwu of Guangwu Emperor in the Eastern Han Dynasty (AD 54), official support has been officially used in chronology.