The ancients divided the stars in the sky into four areas by observing the astronomical phenomena, namely, Qinglong, Baihu, Suzaku and Xuanwu. There are seven stars in each field, namely:
The seven nights of the East Palace Black Dragon are Jiao, Kang, Bian, Fang, Xin, Wei and Ji;
The seven nights that Nangong Suzaku belongs to are: well, ghost, willow, star, Zhang, wing and bird;
The seven nights that Xigong White Tiger belongs to are: Kui, Lou, Stomach, Ang, Bi, Gou and Shen;
Gong Bei Xuanwu (tortoise and snake) belongs to seven nights: fighting, ox, female, emptiness, danger, house and wall.
Twenty-eight stars are an important creation of ancient astronomy in China. They divided the stars passing through the south meridian into twenty-eight groups, and each group was named after one word: horn, sound, surname, room, heart, tail, dustpan, bucket, cow, female, deficiency, danger, room, wall, depression, building, stomach, pride, bi, tapir, ginseng and so on.
Kang Jinlong, Mother Earth Bat, Fang Ri Rabbit, Xinyue Fox, Tail Fire Tiger, Jishui Leopard, Unicorn, Niujinniu, Nyctereute, Rising Sun Rat, Dangerous Moon Swallow, Indoor Fire Pig, Wall Water Scorpion, Kuimu Wolf, Loujin Dog, Stomach Earth Scorpion, Ruori Chicken, Bi Yuemu, Gou.
Twenty-eight constellations is one of China's ancient astronomical theories. It divides the stars in the southern transit into 28 groups. According to them, the celestial phenomena that circulate endlessly along the ecliptic and equator and distribute in the east, west, north and south directions are named by metaphysicists as: horn, sound, surname, room, heart, tail, dustpan, bucket, ox and luck.