How did China divide the stars in the night sky in ancient times?

Divided into three walls and four elephants.

The three walls are Wei Zi Wall, Qiu Wall and Shi Tian Wall.

Ziweiyuan is divided into two walls, the * * * 15-star area and the 39-star palace.

Taiwei Courtyard is divided into 20-star palace, 78 positive stars and 100 plus stars.

Shi Tian City Wall is divided into 19 star palaces, 87 main stars and 173 additional stars.

The four elephants are Qinglong, Suzaku, White Tiger and Xuanwu.

Under the four images, there are 28 star regions and 42 constellations, which correspond to birthdays.