First, Spring and Autumn Annals is the first record of time. "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. Secondly, Huai Nan Zi is the first one in the early records. "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. Third, 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.

"Historical Records of Qin Shihuang's Biography" records: "In the seventh year of Qin Shihuang, comets first appeared in the east, north and west in May ... 16, comets reappeared in the west." This is the earliest record of Halley's comet recognized by scholars all over the world. The seventh year of Qin Shihuang was 240 BC. From that time to 19 10, Halley's comet * * * returned 29 times, which is recorded in Chinese history books and local chronicles.

In fact, Halley's Comet was recorded in China's ancient books. Such as the Spring and Autumn Annals, Zuo Zhuan, Historical Records, General Examination of Documents and other historical masterpieces, there is a record of the autumn and July of the fourteenth year of Lu Wengong, and there is a record of the victory of the stars in Beidou. In the 14th year of Lu Wengong, 6 13 BC. Many Chinese and foreign scholars regard this record as the earliest regression record of Halley's comet.

A famous astronomer in China, Mr. Yuzhe Zhang, made textual research on "A Brief Introduction to Huainanzi's Soldiers" in his later years, in which he said, "The King of Wu attacked the enemy, welcomed the spring in the east, and came out with the comet ... which gave the Yin people a handle." It is believed that the comet that appeared at that time was also Halley's comet. He calculated the orbital changes of Halley's comet in the past 4000 years, and confirmed from other mutually corroborating historical materials that the exact age of King Wu's cutting should be BC 1056. Therefore, the earliest recorded age of Halley's comet in China has been pushed forward for more than 400 years.