What does Yuannan mean by being in the moon column?

Yuan nan's life in the moon column is placed on the arranged moon column, which is convenient for people to interpret. According to relevant public information, the stem and branch of the year, month, day and hour are combined to form an annual column, a moon column, a sun column and a time column, so the eight characters are also called four columns or four-column eight characters, which are marked on the moon column in the four columns, that is, the position of the moon column, so that people who are convenient to interpret can know at a glance that they are human eight characters.