What is the formula for twenty-eight nights?

The corner of the room is high, the tail of the room is white, the wall of the dangerous room for bullfighting women, the belly of the Wei Xiao building is full of ginseng, and the ghost Liu Yi is the 28-star area divided by ancient Chinese astronomers for observing the five-star operation of the sun, the moon and the five stars. It is a local celestial literature creation in China, which is used to explain the positions of the sun, the moon and the five stars. Commonly known as "28 stars"

Details are as follows:

Twenty-eight stars:

Seven Nights of the Oriental Black Dragon: Jiao, Kang, Bian (dρ), Fang, Xin, Wei and Ji (jρ).

Seven nights in northern Xuanwu: fighting (dǒu), cows, women, emptiness, danger, houses and walls.

Seven Nights of the West White Tiger: Kui, Lou, Chang, Bi, Gou and Shen.

Seven Nights in South Suzaku: Well, Ghost, Willow, Star, Zhang, Wing and Zhu.

There are several stars every night. As an important part of China's traditional culture, it has been widely used in ancient astronomy, religion, literature and astrology, astrology, geomantic omen, lucky choice and so on.

Different fields give it different connotations, and the related content is very complicated.

At present, the twenty-eight lodging system can be traced back to the early Shang and Zhou Dynasties, and it was complete in the Spring and Autumn Period and the Warring States Period. Records of twenty-eight hotels and four elephants were first recorded in the early Warring States Period. In terms of cultural relics, the lacquer box of the tomb of Zeng Houyi in the Warring States period unearthed in Suixian recorded the complete names of 28 hotels for the first time.

It is recognized by historians that Twenty-eight Nights was first used in astronomy, so its position in the history of astronomy is quite important and it has always been a topic of interest to Chinese and foreign scholars.

Extended data

The correspondence between twenty-eight hotels and twelve branches

The earthly branch is the core content of ancient astronomy in China and the most important symbol of ancient astronomy in China. The earthly branch originated from the ancient 28 stars, which is another expression of the year. The way to create earthly branches is to use some astrological symbols of 28 stars.

Twenty-eight huts start from Cacuk and are arranged from west to east, which is opposite to the direction of the sun and the moon.

The East is called Qinglong: Jiaomujiao, Kang Jinlong, Nyctereute, Fangri Rabbit, Xinyue Fox, Tail Fire Tiger and Jishui Leopard;

The northern part is called Xuanwu: unicorn, Taurus, mother bat, rising sun rat, dangerous moon swallow, room fire pig, wall pheasant *;

In the west, white tigers are called: wood wolf, Lou Jin dog, stomach pheasant, chicken, bi, gun and fire monkey;

In the south, it is called Suzaku: Muan Jing, Ghost Golden Goat, Swertia liutu, Stellar Horse, Zhang Yuelu, Winged Fire Snake and Lumbricus.

In ancient times, in order to observe the movements of the sun, the moon and the five planets (gold, wood, water, fire and earth), people chose 28 constellations near the ecliptic and the equator as symbols, collectively called 28 constellations or 28 stars.

Horn, sound, rafter, room, heart, tail, dustpan, these seven stars form the image of a dragon, and the vernal equinox season is in the eastern sky, so it is called the Oriental Qinglong for seven nights;

Fighting, ox, female, air, danger, house and wall, these seven stars form a group of images intertwined with turtles and snakes. The vernal equinox season is in the northern sky, so it is called the seven nights of Xuanwu in the north;

Kui, Lou, Wei, Chang, Bi, Gou and Shen, these seven stars form the image of a tiger. The spring equinox season is in the western sky, so it is called the seven nights of the western white tiger.

Well, ghosts, willows, stars, Zhang, wings and birds, these seven stars make up the image of a bird. The spring equinox season is in the southern sky, so it is called South Suzaku for seven nights.

The four animal images composed of the above seven nights are collectively called four elephants, four dimensions and four beasts. The ancients used the appearance and arrival times of the four elephants and the twenty-eight stars to judge the seasons. The ancients saw the solar terms facing south, so there was a saying that there was a dragon in Zuo Dong, a white tiger in the right west, Xuanwu in the north and Suzaku in the south.

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