What is the only constellation that intersects with another constellation?

One of the zodiac signs. Located in the south of Wuxian, north of Scorpio and Sagittarius, and west of the Milky Way. It is the only constellation in the sky that intersects with another constellation, Ophiuchus, and it is also the only constellation in the sky that crosses the celestial equator, the galactic path and the ecliptic. This is a big and wide constellation, basically a big rectangle. The celestial equator obliquely passes through this rectangle. Although Ophiuchus spans a short silver passage, the center of the Milky Way is Sagittarius, not far from the southeast corner of Ophiuchus. The Milky Way has a prominent winding part here, forming the widest range of the Milky Way. Although the zodiac passes through Ophiuchus, Ophiuchus is not the zodiac. Every year, at about165438+1October 29th, the sun moves in Ophiuchus after rising from Scorpio, and it does not enter Sagittarius until about 65438+February 19. None of the 24 solar terms on the ecliptic is in Scorpio, but there are 1 solar terms on this ecliptic section of Ophiuchus. This is because the starry sky of Ophiuchus once belonged to Scorpio in ancient times, but the bright star at the tail of Scorpio was too south, and Ophiuchus' feet were nowhere to be placed, so this part of the starry sky, as well as the extra starry sky unrelated to Scorpio's size, was classified as Ophiuchus from Scorpio. Ophiuchus has a famous Barnard star, which is the second closest neighbor of the solar system after Nanmen II and the fastest star in the whole day. It moves a distance of the diameter of the moon on the celestial sphere every 180 years.

It is said that Phobos Apollo Asclepius became a famous doctor with superb medical skills under the guidance of his teacher Kay Long Xing, a centaur. Thanks to his careful research, he cured many patients and made fewer and fewer people die. This angered the guardians of the underworld. Hades complained to his brother Zeus, who was the God of God. In order to maintain the authority of the protoss, he shot Asclepius with a thunder hammer. But after killing Asclepius, Zeus regretted it, thinking that he was a kind doctor and worthy of respect, and it was unreasonable to kill him. So he took Asclepius's soul to heaven and became Ophiuchus. Asclepius in the constellation has a spotted snake in his hand. This is Ophiuchus. Because the ancient Greeks regarded snake molting as rejuvenation, and the job of doctors was to rejuvenate people.

Learning point

Silver Island and Galaxy Coordinate System

The Milky Way refers to the great circle where the discus-shaped celestial bodies composed of most stars in the Milky Way intersect with the celestial sphere through a plane (called galactic plane) perpendicular to the center and rotation axis of the Milky Way. The coordinate system with galactic plane as the basic plane is called the Galaxy coordinate system. Two points 90 degrees apart on both sides of the silver channel are called silver poles. The silver pole adjacent to the North Celestial Pole is called the North Silver Pole, and the silver pole adjacent to the South Celestial Pole is called the South Silver Pole. Any great circle passing through the silver pole is called the silver meridian circle; The small circle parallel to the silver channel is called the silver weft circle.