The Book of Tianguan in the Records of the Grand Historian states: "The Big Dipper, also known as the Big Dipper, is composed of the seven elements of rotation, Ji, Yuheng, and Qi. Dou is the imperial chariot that is transported to the center and controls the four townships. It is divided into yin and yang, and the four seasons are established with the five elements. The rules and regulations are adjusted, and various records are established, all of which are tied to Dou