The ancient name of the Big Dipper.

The Big Dipper belongs to Ursa major. China was called the plough Beidou in ancient times: Tianji, Tian Xuan, Shu Tian, Tianquan, Yuheng, Kaiyang and Yaoguang. The first four stars are called "Dou Kui" or "Xuan Ji"; The last three stars are called "bucket" and "bucket handle". These seven stars are α, β, γ, δ, ε, ζ, η in Ursa major, and the other six stars are all second-class except the celestial force δ. The line connecting Tian Xuan β and Shu Tian α is about five times longer, and Polaris can be found. Therefore, beta and alpha stars are also called "Polaris". From handle to spoon, they are Tianji, Tian Xuan, Shu Tian, Tian Quan, Yuheng, Kaiyang and Yaoguang. There is another saying about their names: Pojun, Wu Qu, Lian Zhen, Wen Qu, Lucun, Giant Gate, Wolf-greedy.