The relationship between Andromeda and Ursa major.

Andromeda is one of the 88 modern constellations in Japan and one of the 48 constellations listed by Ptolemy, a Greek and Roman astronomer in the 2nd century. The main star of Andromeda, M3 1 (Andromeda galaxy), is one of the largest members of this galaxy group. In Greek mythology, Andlau Meda symbolizes Andlau Meda, a goddess who is locked on a rock and ready to be swallowed by the sea monster Ceto. Andromeda is the easiest to watch in the autumn night in the northern hemisphere, and there are also constellations symbolizing other gods in Perseus mythology.

Andromeda is located below Ursa major, near Pegasus. The fairy's head is Cedius, a corner of the Pegasus quadrangle. Andromeda, because of its northern declination, can only be seen in the area north of the 40-degree south latitude line, and the area south of 40-degree south latitude will be below the horizon. Andromeda is one of the largest constellations in the celestial sphere, with an area of 722 square degrees, which is 1400 times of the full moon, 55% of the largest Ophiuchus and more than ten times of the smallest Southern Cross.

Ursa minor, the name of the constellation, is the Polaris constellation closest to the north celestial pole. Both Ptolemy and Modern Eighty-eight constellations include Ursa minor. Ursa minor marks the position of the north celestial pole, and Alpha Ursa minor, the brightest star in the constellation, is the current Polaris.

Perseus is one of the famous northern constellations. Every year, the center of Perseus crosses the sky on the night of165438+1October 7. People who live in the north of 3 1 degree south latitude of the earth can see the complete Perseus. Perseus is located in the east of Cassiopeia and Andromeda. Every autumn night, observers can find Cassiopeia in the northern sky, or Andromeda in the northeast of Pegasus Square, and then patrol along the Milky Way. Perseus is easy to find, which is made up of several second-class to third-class stars arranged in an arch or "herringbone" shape. Perseus occupies the 24th place with 6 15 square degrees. Latitude changes between+90 and? 35, and the best observation month is 65438+February.

Orion, one of the zodiac signs, lies between Gemini, Unicorn, Canis Canis, Taurus, Rabbit, Bojiang and Canis Canis, and its northern part is submerged in the Milky Way. The main body of Orion consists of four bright stars, Betelgeuse and Betelgeuse, forming a quadrilateral with an area of 594 square degrees, ranking 26th. Latitude changes are located at +85 and? 75, and the best observation month is 1.