What constellations are there in the northern sky in autumn? Please give three examples.

In autumn, the royal constellations in the northern sky are composed of fairy queen, fairy king, fairy, Perseus and Pegasus. Cassiopeia is a branch of McDonald's in the sky, shaped like an "M" or "W". If you find Cassiopeia, you can find Polaris. Cepheus is located in the northwest of Hou Xian. It consists of five dark stars in the shape of short pencils. This constellation is famous for Cepheid variable stars. The fairy king and the fairy queen got married and gave birth to a fairy. Andromeda is located in the south of Cassiopeia. It is mainly composed of three bright stars, namely α star, β star, Milla strange star and γ star, which are connected into Arabic numeral "1" and point to the northeast. Therefore, there is a saying in the formula of autumn star recognition song: "the fairy word refers to the northeast."

Andromeda beta star is about 2.3 million light-years away, at 0/0 degree north of Milac/KLOC. It is another galaxy outside the Milky Way and the only one that people living in the northern hemisphere can see without a telescope. We call it "M3 1 Andromeda Galaxy".