The Big Dipper is composed of seven stars: Tianshu, Tianxuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang.
Starting from the upper part of the dipper body to the end of the handle, the seven stars of the Big Dipper are named α, β, γ, δ, ε, ζ, and eta in order. Ancient Chinese astronomers called them respectively: Tianshu, Tianxuan, Tianji, Tianquan, Yuheng, Kaiyang, Yaoguang. Extend a straight line from "Tianxuan" through "Tianshu", about five times longer, and you can see a star that is about as bright as the Big Dipper. This is the North Star.
Extended information:
In ancient times, Beidou was placed in an extremely important position. Sima Qian, the historian of the Han Dynasty who was also an astronomer, said it well in his great work "Historical Records? Tianguan Shu": "Dou is the imperial chariot, transported in the center, controlling the four directions, dividing yin and yang, establishing the four seasons, balancing the five elements, and moving Jiedu, Dingzhu, etc. are all tied to fighting." This means that Beidou is the ruler that determines direction, season, and time.
"Celestial Star Chart": "The Big Dipper is near the south of Ziwei Palace and in the north of Taiwei. It is called the emperor's chariot. It is transported to the center with the Lord's orders, and it controls the four directions and builds the four seasons. The five elements are balanced, the degrees are moved, and all disciplines are determined, all tied to the Big Dipper. "The Seven Stars of the Big Dipper regulate the laws and regulations, govern the universe, and judge the world's life, death, misfortunes, and blessings."
In the star culture, stars are not just talk about, but are related to each of our lives, called natal stars. In the Taoist system, the natal star king is the Big Dipper star to which everyone belongs.
The natal star is based on each person's zodiac sign. Different zodiac signs have different natal stars. The Beidou we usually see is the seven stars, and there are also the hidden two stars. As for the natal star king, it is the seven stars that appear. Each star king is in charge of people of different zodiac signs. Each of us has a natal star. For example, if you are born in the year of Zi, your natal star will be Greedy Wolf; if you are born in the year of Chouhai, your natal star will be Jumen. Others can be deduced by analogy.
Reference: Baidu Encyclopedia-Big Dipper