Scientific knowledge about stars

The Big Dipper is a part of Ursa major. Graphically, the Big Dipper is located at the back and tail of Ursa Major. Of these seven stars, six are secondary stars and one is tertiary. Through the connection of the two stars in the mouth of the bucket, it extends about 5 times in the direction of the mouth of the bucket and finds the Polaris.

"Star Recognition Song" has: "Star recognition begins with Beidou, and then begins from north to west." Beginners can look for other constellations in turn from the Big Dipper.

The Big Dipper is named α, β, γ, δ, ε, ζ and η respectively from the upper end of the bucket to the end of bucket handle. In ancient China, they were called Shu Tian, Tian Xuan, Tianji, Tianquan, Yuheng, Kaiyang and Yaoguang respectively. From "Tian Xuan" to "Shu Tian", a straight line extends outward, about.

More than five times longer, you can see a star that is almost as bright as the Big Dipper, that is, the North Star.

Taoism calls the Big Dipper the Seven-Yuan Xie Hexing King, who lives in the Seven Palaces of the Big Dipper, namely: Shu Tiangong Wolf-greedy Star King, Tian Xuan Palace Giant Gate Star King, Tianjigong Lucun Star King, Tianquan Palace Wenqu Star King, Yuheng Palace Lian Zhen Star King, Kaiyang Palace Wuqu Star King and Yaoguang Palace Broken Army Star King.

The position of the Big Dipper in the sky is different in different seasons. Therefore, the ancients in China determined the seasons according to their position changes: "bucket handle refers to the east, and the world is spring; Bucket handle guide, the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and it is winter all over the world. "

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.

Therefore, in the long cosmic changes, the shape of the Big Dipper will change greatly. After 654.38+ million years, we will not see this handle shape.

It seems that it is enough to cooperate with the first few.