What did Yuan Tiangang study? See feng shui, face, divination. What is this occupation?

: hello.

Yuan Tiangang served as a salt official in the Sui Dynasty. After entering the Tang dynasty, he was appointed as a volcano order. Taoist priest. Astronomers, astrologers. Divination is his hobby. Tell people fortune in their spare time.

In the previous dynasty, Zhu Gekongming studied astronomy from the upper class and geography from the lower class. There are no special teachers, most of them are self-taught.