What is a birthday? What are the nine planets used for?

The eight characters, also called four pillars, are heavenly stems and earthly branches's eight characters found in the calendar, which represent the year, month, day and time of a person's birth with the heavenly stems and earthly branches of heaven and earth. It adds up to eight words. Eight-character (eight-character numerology, eight-character numerology) is a method to infer fate according to eight characters.

There is a theory of the Big Dipper in astronomy. Their rankings are White Wolf, Black Giant Gate, Three Green Wen Qu, Huang Wu Lian Zhen, Six Baiwuqu and Seven Red Pojun. These seven stars are called the Big Dipper, and there are two stars between Pojun, bucket handle and Wu Qu. One star is right-handed, the other is common in Zuo Fu, and Zuo Fu ranks eighth and right. Nine planets in geomantic omen: Legend has it that one is white, two is black, three is green, four is green, Huang Wu is six is white, seven is red and eight is white, and nine purple is white. The nine planets in Taoism refer to zenith, Tian Rui, Tian Chong, Tianfu, Tianjie, Tianxin, Tianzhu and Renxing. Others call the Big Dipper the nine planets after adding Zuo Fu and Youbi.