What is the largest constellation among the 88 constellations?

Ophiuchus is the longest and largest constellation among the 88 constellations in the whole day. In the spring night sky, it winds in the south of the constellations such as Cancer, Lion, Virgo and Libra, spanning a quarter of the whole day.

Ophiuchus is long, but it is not dazzling. All the stars in Ophiuchus are very dark except a red second-class bright star (that is, the alpha star of Ophiuchus, which China called "shrinking star one"), so Ophiuchus is not very noticeable. To the south of Cancer, there are five third-class stars and fourth-class stars in the lower right of Leo alpha star Xuanyuan 14, which form a small circle, which is the head raised by the long snake. Located in the southwest of Xuanyuan 14, constellation I is equivalent to the heart of a long snake. There are no other bright stars around the star, so Arabs call it a "lone ranger".

The stars rose in the east half an hour later than Xuanyuan Fourteen and set in the west two and a half hours earlier than Xuanyuan Fourteen. The outline of a star and many dark stars symbolizes the body of a long snake. It swims southeast under Leo and Virgo, and its tail reaches Libra.

In ancient Greek mythology, Ophiuchus was the incarnation of Xu Dela, the water snake spirit. Legend has it that Xu Dela has nine heads, and it can spew poisonous gas from nine mouths, which is harmful to people and animals. If one head is cut off, two heads will be born immediately, which is more fierce than before. Hercules, the hero of the earth, took his nephew Olaus with him to find the water snake essence to kill people after destroying the lion essence. Every time Hercules cut off the head of a water snake essence, his nephew immediately burned the wound so that the snake head could not grow. In this way, they finally eliminated the water snake essence. In order to commemorate the achievements of Hercules, Zeus, the god of heaven, lifted the essence of the water snake destroyed by Hercules to the sky and listed it as Ophiuchus.

On the "back" of Ophiuchus, the Grand Duke skillfully connected with it, as if he had specially put a big bowl on Ophiuchus. There is a crow (crow's nest) on the tail of a long snake extending eastward, and it keeps pecking at it with its mouth.