What does Shu Tian and Tian Xuan of the Big Dipper mean?

This is the name of seven stars: Shu Tian, Tian Xuan, Tianjing, Tian Quan, Wu Yuheng, Kaiyang and Yaoguang. The ancients associated these seven stars together and imagined them as barrels of wine in ancient times, hence the name Beidou.

The Big Dipper appears in different directions in the sky in different seasons and at different times at night, so the ancients decided the seasons according to the direction pointed by bucket handle when he fainted for the first time: 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.

Shu Tian, Tian Xuan, Tian Ji and Tianquan are composed of Dou Shen and Gu Yue Kui. Yuheng, Kaiyang and Yaoguang are composed of bucket handle, which was called Piao in ancient times. Difference: The seven stars in Ursa Major are called Little Beidou; The emperor star is in Ursa minor, and Beidou is in Ursa major. The so-called bucket is an emperor car.

Extended data:

Among the Big Dipper, "Yuheng" is the brightest, and its brightness is almost close to the first-class star. "Tianquan" is the blackest and is a third-class star. The other five are all second-class stars.

There is a small companion star named Fu near Kaiyang, which has always attracted people's attention with its beautiful and clear appearance. It is said that ancient Arabs used it as a "test star" to test soldiers' eyesight when recruiting soldiers.

The Big Dipper always moves slowly in the sky. Five of the stars move in one direction at roughly the same speed, while Shu Tianhe and Yao Guang move in the opposite direction.