The pentagon composed of five bright stars on the north side of Bisu is also a famous star official, called the five cars, which is said to be the royal parking lot of the five gods of the east, west, south, north and middle. However, some scholars believe that the five vehicles represent the five kinds of military vehicles in ancient times, namely rongche, Cantonese, Queche, Pingche, and Light Vehicle. I don't know when the five cars and five stars and the five grains of the feng apology are also linked, and some astrological books even give the specific crops corresponding to each star: the northwest star (five cars two) is in charge of the beans, the northeast star (five cars three) is in charge of rice, the southeast star (five cars and four) is in charge of hemp, the south star (five cars and five cars) is responsible for millet, and the northwest star (five cars and one) is responsible for wheat.
There are also three groups of nine pillar stars around the five vehicles, which represent the flagpoles on the chariots and are used to divine the number of troops deployed in the war. It is said that if the three groups of pillar stars disappear, it will indicate that the world's soldiers and horses will be exhausted and the emperor will march in person.
There are also two star officials in the five cars, Tianhuang and Xianchi. Tianhuang is a pool of sediment in the sky, which may be understood here as a car wash horse pond in front of the Five Emperors' Car House. The Salty Pond is a fish pond and a legendary place to bathe in the sun.
In winter, the Beidou in the low latitude area is located in the northern low altitude, we can use the five cars to find the North Star, and extend the connection of the five cars four and the five cars three by 5 times to find the North Star.
The Heavenly Garden is a vegetable and melon and fruit plantation in the sky, and perhaps the peach orchard managed by Qi Tian Dasheng is among them.
Tianguan Guest Star - a crab across ancient and modern times
Tianguan star is not far south of the five cars, close to the position of the ecliptic, is the sun, moon, five elements of the necessary place to run, so the ancients set up the "Tianguan" here this level. In the early morning of July 4, 1054, the officials in charge of astronomical observations of the Northern Song Dynasty were stunned by a star that had just risen from the eastern horizon, an unprecedented star that was unusually bright and stood motionless next to the Tianguan Star, which was clearly a guest star. The guest star became brighter and brighter, soon surpassing Venus, and could be seen for 23 consecutive days, only to slowly darken and disappear after about two years, which is the famous "Tianguan Guest Star".
48 years ago, when Zhou Boxing appeared, there was a Zhou Keming who claimed to be a sign of good fortune. This time, another "retired cadre" Yang Weide, who had held an important position in Si Tianjian for a long time, jumped out, believing that the guest star emblem had brilliance and was yellow, which was a sign that the country had great sages, so he asked for congratulations from hundreds of officials. Emperor Renzong of Song was overjoyed, so he praised the government and the public, and a good faction was peaceful and prosperous. But this time, the problem is also in the color, "Song Huijiao" called the guest star "four horns, red and white." ”
The M1 Crab Nebula photographed by the Hubble Space Telescope
The story of The Celestial Star did not end with its disappearance, and in 1758, the famous comet hunter, the Frenchman Charies Messier, discovered a cloud-like object in the area, which he initially thought was a comet, but soon discovered that the object was not moving at all. It was the discovery of this object that prompted him to compile a catalogue of nebulae so that people would not mistake such objects for comets. So the object was included in his position as the boss in messier's catalogue, later known as M1. Because of the way it opens its teeth and claws, people nickname it crab nebula.
In 1921, when astronomers compared images of the crab nebula taken years apart, they found that the nebula was expanding, and the beginning of the expansion was about 900 years ago. At this time, someone thought of the Chinese documentation of the 1054 Tianguan guest star, and proved that this nebula was the product of the supernova explosion. In 1968, another pulsar was discovered in the nebula. The study of the Crab Nebula has always been one of the hotspots of contemporary astrophysics research, and the observation records of the ancient Chinese once again provide important first-hand information for the world.
Chinese and Western comparisons
The name Eridanus derives from the Po River in northern Italy. It's a huge constellation with a long history, but in China, it's not until south of the Yangtze River that you can barely get a glimpse of it. The middle reaches of the river roughly correspond to the stars of the Tianyuan, while the lower reaches basically overlap with the Tianyuan.