In the horoscope, the heavenly stems are above the sky, for heaven and for qi, so the heavenly stems in the horoscope are moving, not static. According to the Long Jing Qing Classic, when the sky moves, the sun, the moon and the stars change at four o'clock, and the high-altitude airflow interacts. Therefore, the heavenly stems in the eight characters are not affected by the "separation" of the four pillars, and can be mutually restricted, combined and generated at any time. As far as the relationship between heavenly stems and earthly branches is concerned, although we often think that there will be a relationship between branches of the same column, in the original eight-character theory, a heavenly stem can be related to any branch of the earth, which is caused by the constant movement of heavenly stems.