Classic works of yin-yang and five elements theory

The most important ones are Zhouyi and Shang Shu Hong Fan Pian, followed by Fan Lu in the Spring and Autumn Period and Yi Tong the White Tiger. Other books are derived from this, such as Huangdi Neijing in medicine. The above books are combined with some ancient astronomical works, such as Zhan Jing in Kaiyuan, forming astrology, which is used for fortune telling and confusing people with myths.