China attached great importance to the Big Dipper in ancient times. The Classic of Shigan Star: "The Big Dipper is called the Seven Mansions, the Prince of Heaven, and also called the Emperor Car." The emperor sat on the Big Dipper and inspected the four directions. It was cold and hot at four o'clock. Take the change of Beidou bucket handle direction as one of the signs to judge the season. The ancient book "Guo Guanzi" records: "Dou Dong refers to human spring; Fighting in the south and fighting in the north, the world is summer; Fighting against the west means that the world is autumn; The northern war is the winter in the world. " In ancient times, Polaris was regarded as the symbol of the emperor, and Beidou was the imperial chariot that the emperor drove when he was touring the world. In the spring of a year, when Beidou is in the east, God begins to patrol from the east, so it is easy. Biography: "Emperor Jing", divination is in the east.