The first 6 13 Spring and Autumn Annals contains the earliest record of Halley's comet in the world. The appearance of stars is recorded in detail. As for the early records of time, Chunqiu is the first one. "Spring and Autumn Annals" said: In the fourteenth year of Lu Wengong (6 13 BC), "In autumn and July, a star entered the Beidou." This is the first exact record of Halley's comet in the world. Regarding the contents of early records, Huai Nan Zi in the Western Han Dynasty is the first one. "A Brief Training of Huainan Zibing" said: "The king of Wu attacked Zhou, welcomed the Spring East, reached the water, and the comet came out, giving the Yin people a handle." According to China astronomer Yuzhe Zhang, this is the record of the return of Halley's Comet in BC 1057. Since 240 BC, every time Halley's Comet appeared, China has recorded the number of times and detailed records, which other countries have not. The original mass of Halley's comet is estimated to be less than 65.438+0 trillion tons. If the average density of the nucleus is about per cubic centimeter 1g, then the radius of the nucleus should be less than 15km. It is estimated that its mass will be reduced by about 2 billion tons per revolution, which is only a small part of its total mass, so it will exist for a long time.

Shi Gan Xing Jing is the earliest astronomical work in the world. On the basis of long-term observation of astronomical phenomena, during the Warring States Period, the Chu people Gande (now Hubei) and Ren Wei Shen Shi (now Kaifeng, Henan) each wrote an astronomical work. Later generations called these two works A Passage to Shi Gan. The book records the names of 800 stars, among which the position of l2l star has been determined, which is the earliest star list in the world. The book also records the operation of the five planets, namely, wood, Mars, Saturn, gold and water, and finds their unforgettable laws. According to legend, Stone God wrote eight volumes of astronomy, and he measured 138 stars with 800 stars.

China people have been paying attention to astronomical phenomena for a long time. The records of meteor shower and solar eclipse in ancient books are the earliest records in the history of astronomy 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 all over the world, was recorded in the history book Lu Chunqiu as early as 6 13 BC, which is the earliest record of Halley's comet in the world.

Astronomical monographs also appeared in this period, such as Tian Wenxing Zhan, written by Gander of Qi, and Astronomy, written by Shi Shen of Wei, which were later combined into one book, called Shi Ganxing Jing, which is the earliest existing astronomical works in the world. The book records the movements of the five planets, water, wood, gold, fire and earth, and their unforgettable laws. The book also recorded the names of 800 stars, and now the position of 12 1 has been determined. 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 the solar eclipse was a phenomenon in which 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.