What is the earliest astronomical work?

The earliest astronomical work in the world is China's Shi Gan's Astrology during the Spring and Autumn Period and the Warring States Period.

Astronomy developed in China during the Warring States Period. At that time, a group of astronomers appeared, whose main job was to predict the fate of the emperor of the dynasty. As the earliest astronomical work, it has long been lost in the long river of history, and only scattered fragments in historical records have been circulated so far.

Shi Gan Xin Jing was written by astrologers Gan De and Shi Shen in the Spring and Autumn Period of China. According to historical records, the book "Shi Gan Xin Jing" mainly records the various operating states of the five stars, and also describes the appearance and laws of the five stars in detail. It is reported that there are hundreds of star names recorded in the book, and the star officer of each star also belongs to his own system. This system has a great influence on the development of astronomy, and later astronomical research has also been influenced by it.