In the four-column eight-character numerology, everyone's date of birth can be divided into four parts: adulthood, month, date and time, in which the year, month and day are represented by heavenly stems and earthly branches respectively, and the time is represented by earthly branches. Tiangan Ding Huo ranks fourth among the top ten tiangan, while Dizhi garrison ranks ninth among the twelve Dizhi. According to the arrangement order of the ten heavenly stems and twelve earthly branches, Ding Huo appeared before Renzi, that is, the moon column appeared at noon.
As a result, the sky was dry and Ding Huo was exposed at noon.