Ophiuchus is the longest and largest constellation among the 88 constellations in the whole day, spanning 1/4 of the sky, and it is also one of the 48 constellations listed by Ptolemy. Contains the ancient constellations of China: Liusu, Waichu, Xingsu, Zhangsu, Pingping, Wing Su, Qingqiu and Zhanche. In addition to a red second-class bright star (that is, alpha star of Ophiuchus, China called "Star One"), the rest of the stars are very dark, so Ophiuchus is not very noticeable.
To the south of Cancer and to the lower right of Alpha Star Leo (Xuanyuan XIV), there are five third-class stars and fourth-class stars forming a small circle, which is the head raised by the long snake. Located in the southwest of Xuanyuan 14th, Constellation I is equivalent to the heart of a long snake.
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Constellation myth:
Hydra originally means "lizard" in Latin, and there are two legends about Ophiuchus: It is said that Ophiuchus is the incarnation of Xu Dela, the water snake spirit. This snake essence has nine heads and nine mouths, and it is extremely harmful. If you cut off one of its heads, two heads will grow immediately, which will multiply the ferocity. After Hercules, the hero of the earth, destroyed the lion essence, he went to look for the water snake essence with his nephew Iolaus to kill the people.
In order to prevent the snake essence's head from multiplying, they adopted a wonderful method: whenever Hercules cut off a snake head, Iolaus immediately burned the wound on the snake essence's neck with fire, so that the snake head could not grow. With courage and wisdom, they finally destroyed the water snake essence.
To commemorate the achievements of Hercules, Zeus lifted this water snake essence into the sky. Whenever people see this long snake, they will miss this hero Hercules who fought bravely against the water snake essence.
Another story is that the crow (crow) who brought water for Apollo in Greek legend snub on the road and got back a water snake. Apollo saw through the scam and threw the crow, the water cup (Grand Jue) and the water snake (Hydra) into the sky. These celestial zones were also called "sea" in ancient times.
Baidu encyclopedia-Ophiuchus