What is the earliest astronomical work in the world?

During the Spring and Autumn Period and the Warring States Period, astronomy made quite high achievements. Astronomers in Lu observed 37 eclipses, 33 of which were proved to be reliable. Halley's comet, which is now known to the world, was recorded in the history book Lu Chunqiu as early as 6 13 BC, which is the earliest Halley's comet record in the world. The west was not discovered by Harley until 1682, more than two thousand years later than China.

Astronomical monographs also appeared during the Warring States Period, such as Astronomy by Gan De, an astronomer of Qi State, and Astronomy by Shen Shi of Wei State. Later generations combined these two works into one, and called them The Passage of Shi Gan. This is the earliest astronomical work in China and even in the world.

A Journey to Shi Gan records the movements and laws of five planets: water, wood, gold, fire and earth. The book also measured the orientation of 12 1 star and recorded the names of 800 stars. This is the earliest catalog in China and even in the world, which is about 200 years earlier than the first European catalog compiled by the Greek astronomer Ibagu.

Gander also discovered Jupiter's moon with the naked eye, more than 2,000 years before Italian astronomer Galileo discovered the star with an astronomical telescope in 1609. Stone gods found that solar eclipse and lunar eclipse were phenomena that celestial bodies blocked each other, which was also valuable at that time. To commemorate the stone god, there is a crater on the moon named after him.

Many astronomers in later generations will use the data in Shi Gan's astrology when measuring the position and movement of the sun, moon and planets. Therefore, Shi Gan Xing Jing occupies an important position in the history of astronomy in China and even in the world.