1. The year column, that is, the year a person is born is represented by the stems and branches of the solar calendar, that is, the year of the stems and branches. The year column is updated at the beginning of spring every year. : The four pillars and eight characters are all based on the solar terms of the solar calendar and do not refer to any lunar calendar content. The Ganzhi calendar belongs to the solar calendar. The beginning of spring is the beginning of the year.
2. The four pillars are the first step in predicting the destiny, that is, the four pillars are arranged according to the year, month, day and time of the person's birth. Since the four pillars are composed of eight stems and branches, they are also called eight characters.