The so-called sky, left Qinglong, right White Tiger, former Suzaku, and later Xuanwu. Therefore, you can know the order of the sun and the moon in the shade of the class, and you can know the cold and heat of the world by seeing the ice in the bottle. In ancient China, the stars in the sky were divided into seven star zones, namely "Three Walls" and "Four Elephants".
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The origin of the four great beasts in China;
In Shang Dynasty, the ancients divided the sky into four palaces, east, west, north and south, named after Qinglong (black dragon), White Tiger, Suzaku and Xuanwu (a turtle-shaped god). In fact, the sky is divided into four parts, which are connected by seven main stars in each part and named after their shapes.
The horn (wood horn), kang (golden dragon), vulture (native raccoon), house (Japanese rabbit), heart (moon fox), tail (fire tiger) and dustpan (water leopard) in the east are shaped like dragons, so the East Palace is called Qinglong or Black Dragon.
The seven western stars, Kui (wooden wolf), Lou (golden dog), stomach (pheasant), Zan (Japanese chicken), Bi (moonlit monkey), tapir (fire monkey) and ginseng (water ape), look like tigers, and call the West Palace the White Tiger.
In the south, wells (wooden roofs), ghosts (golden sheep), willows (earth roes), stars (Japanese horses), Zhang (moon deer), wings (salamanders) and water worms are combined into a bird shape, which is called Suzaku.
The northern seven-star bucket (Mu Yi), ox (Taurus), female (native bat), virtual (Japanese rat), dangerous (moon swallow), house (fire pig) and wall (water book) are shaped like turtles, which is called Xuanwu. As a result, Qinglong, Baihu, Suzaku and Xuanwu have become the four gods who guard the Heavenly Palace, create evil and adjust Yin and Yang.
Baidu Encyclopedia-Four Great Beasts