Constellation connecting Pegasus _ Pegasus galaxy

Pegasus is one of the northern constellations, located in the southwest of Andromeda and north of Aquarius. It is the seventh largest constellation in the whole day. Pegasus is one of the six royal constellations. Pegasus is closer to the ecliptic. Aries and Pisces in the east and Aquarius and Capricorn in the southwest are all constellations on the ecliptic. The four stars that make up the main body of Pegasus are located at the four corners of a square. China is called Virgo I, Virgo II, Gekko I and Gekko II. Betel nut 2 is the brightest. Although it belongs to Andromeda, it is actually shared by Pegasus and Andromeda.

Pegasus is a very important constellation in the autumn sky. Knowing this will make it much more convenient for you to find many other constellations in autumn. The most striking feature of Pegasus is that its three stars, α, β and γ, and the α star of Andromeda form an almost square, which is called the "autumn quadrangle". These four stars are all second-class except the gamma star, so this quadrilateral is very eye-catching in the sky. More importantly, whenever the flying horse reaches the zenith in autumn, the four sides of this quadrilateral just represent one direction, which is simply a "natural locator". Because each side of it represents a direction, you can determine the four directions of southeast and northwest by seeing this square. The east side of the square is generally on the line between vernal equinox and the North Celestial Pole, which extends the same length from this side to the south, that is, vernal equinox; Extending about four times the distance to the north, that is the North Star. The west side of the square extends about 3 times to the south, and the bright star of the southern fish constellation falls on the north gate; Extend about four times the distance to the north, and you will also find the North Star. Because in autumn, the North Star in the Big Dipper is very low in the northern sky, so it is not easy to find it, even in the south of China. Therefore, it is very useful to find the North Star through the autumn quadrangle.

In addition, the lines from Gamma Pegasus and Alpha Andromeda to Polaris are near the 0 red meridian. Through this line, we can roughly estimate the longitude of the celestial bodies we are interested in in in the autumn sky.