How to find the Big Dipper?

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 was named α, β, γ, δ, ε, ζ and η from the upper end of the bucket to the end of bucket handle, which were named in ancient China.

They are Shu Tian, Tian Xuan, Tianji, Tian Quan, Yuheng, Kaiyang and Yaoguang. 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 King Xie Hexing, who lives in the north.

The seven palaces are: Shutiangong Wolf King, Tian Xuan Palace Giant Gate Star King, Tianjigong Lucun Star King, Tianquan Palace Wenqu Star King, Yuheng Palace Lian Zhen Star King and Kaiyang.

Wu Gong Qu Xingjun, Yaoguang Palace Broken Star Jun

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.

Yes

(1) The Big Dipper 654.38 million years ago

(b) The Big Dipper now.

(c) The Big Dipper over 654.38 million years old.

ursa major

Changes of the Big Dipper about 654.38 million years ago. Created by Liu Hongping.