The polar constellation of Polaris.

One of the polar constellations, the Big Dipper in the constellation is the symbol of navigators and surveyors. Seven bright stars are arranged in the shape of buckets and spoons in the northern sky, which is easy to identify. The names of these seven bright stars are: Shu Tian, Tian Xuan, Tianji, Tian Quan, Yuheng, Kaiyang and Yaoguang. The first four stars are called "Dou Kui" or "Xuan Ji"; The last three stars are called "Dou Shao" and "bucket handle". These seven stars are α, β, γ, δ, ε, ζ, η in Ursa major, and the other six stars are all second-class except the celestial force δ. The line connecting Tian Xuan β and Shu Tian α is about five times longer, and Polaris can be found. Therefore, beta and alpha stars are also called "Polaris".

little bear

The constellation closest to the north celestial pole

The northern celestial pole is a pedestal, and the seven main stars are arranged in a bucket shape. Bucket handle ends with an alpha star, that is, the Polaris (Gou Chen Yi) is a triad star and a variable star. The magnitude varies from 1.96 to 2.05, etc. The beta star (Emperor Star) in Doukui is a second-class star, and the gamma star (Prince Star) is a third-class star. These two stars are also called "polar protection stars". Seven stars in the constellation are brighter than four. Polaris indicates the true north direction, and its altitude angle is the geographical latitude of the observation site. Draco is a constellation that can be seen all year round in the northern night sky. It is located in the north of the northern corona. It really looks like a dragon winding between Ursa Major, Xiao Xiong Major and Ursa Major, spanning the vast sky. Gaolongtou is close to Wuxian County and consists of four stars, forming a quadrilateral. The long dragon body encircles the North Star for half a circle. The faucet consists of four stars: 2, 3, 4 and 5. A straight line leads from the two stars in the faucet bucket to the north, and you can find the North Star. It is an arched constellation, which can be seen all year round in the northern hemisphere. On May 24th every year, the center of Draco crosses the sky. Tianlong constellation is the eighth largest constellation in the whole day.

Casio poya

One of the polar constellations. Located in the south of Andromeda and the north of Andromeda, it is far opposite to Ursa major, and can be seen all year round, especially in autumn, because it is close to the north celestial pole. Extending the autumn quadrangle to the north, the gamma star Pegasus and the alpha star Andromeda have a bright 2m star, which is the beta star Cassiopeia (Polaris can be seen farther north along this line). The five brightest stars in Cassiopeia, β, α, γ, δ and ε, form the shape of an English letter "M" or "W", which is the most prominent symbol of Cassiopeia.

Cepheus

It is located in the north of Cygnus and the west of Cassiopeia. Most of it is immersed in the Milky Way, and we can see it all year round. But the brightest star in this constellation is less than 2m, so it is not easy to find. The most beautiful celestial body in Cepheus is the Rainbow Nebula (NGC7023), which is located in the star-rich area of Cepheus 1300 light years away. Nebula material around a huge, hot, apparently still in the formation stage, leaking secret red light, which tells us that a large number of hydrogen atoms are excited by the invisible but intense ultraviolet light emitted by the star on both sides of the bright central region of the star. Cepheus is one of the polar constellations