What does "日干" mean in fortune telling?

Category: Entertainment/Celebrity>> Horoscope

Analysis:

The horoscope is composed of the heavenly stems and earthly branches of the year, month, day and time of your birth. . "Rigan" is the heavenly stem on "日", which may be one of: A, B, C, D, Wu, Ji, Geng, Xin, Ren, and Gui.