How many kinds of astrological credits were there in ancient China?

In ancient China, astrology was divided into 28 nights.

During the Three Kingdoms period, Chen Zhuo, a native of the State of Wu, divided the starry sky into 283 stars, 1, and 465 stars according to the all-sky star maps of Gander, Shishen and Hsien Wu. 283 officials include star officials such as Sanyuan and Erba Hostel. The method of dividing the starry sky into three walls, four images and twenty-eight lodges in Sui Dynasty has been used until modern times.

Three walls

The starry sky around the North Pole is divided into three areas: purple micro-source, too micro-source and Tianshi source.

Four elephants

Oriental black dragon, western white tiger, southern suzaku, northern Xuanwu.

Twenty-eight constellations (division of celestial spheres in ancient astronomy in China)

On the basis of these four images, each image is divided into seven sections, which are called "elements".

According to the change of the position of the stars, the Twenty-eight Hostel divides the sky into 28 regions, each of which represents a specific constellation. Using constellations to represent specific constellations has great application in China's traditional astronomy, Oracle Bone Inscriptions and calendar.