Beidou consists of Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang. The ancient Han people associated these seven stars together and imagined them as barrels of ancient wine. The Big Dipper appears in different directions in the sky at different seasons and different times at night, so the ancients decided the seasons according to the direction pointed by bucket handle at the beginning of fainting: bucket handle points to the east, and the world is spring; Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; The barrel handle refers to the north, and it is winter all over the world.
28 stars
Seven Nights of the Oriental Black Dragon: Jiao, Kang, Bian, Fang, Xin, Wei and Ji (jο).
Seven nights in northern Xuanwu: fighting (dǒu), cows, women, emptiness, danger, houses and walls.
Seven Nights of the West White Tiger: Kui, Lou, Chang, Bi, Gou and Shen.
Seven Nights in South Suzaku: Well, Ghost, Willow, Star, Zhang, Wing and Zhu.
There are several stars every night. As an important part of Chinese traditional culture, it has been widely used in ancient astronomy, religion, literature and astrology, astrology, geomantic omen, lucky choice and so on.
Different fields give it different connotations, and the related content is very complicated.