Where did the earliest record of Halley's Comet come from?

From the fourteenth year of Lu Wengong's Spring and Autumn Zuozhuan. The earliest exact record of Halley's Comet is 6 13 BC (the 14th year of Lu Wengong in the Spring and Autumn Period) "In autumn and July, a star entered the Beidou". This is the first exact record of Halley's comet in the world.

Since 240 BC (the seventh year of Qin Shihuang in the Warring States Period), every time Halley's Comet returns, China has recorded it. Halley's comet records are sometimes very detailed. The most detailed record is 12 BC (the first year of Hanyuanyan). "Xin Wei in July, a week in Tokyo, practicing five governors, out of He Shu North, leading Xuanyuan, is too small. It was more than six degrees the next day, and I went out in the morning and walked east. See the west on the evening of the 13th, be mistresses, the autumn is long, the war is full, and bees rush to the purple palace. When the fire was over, it reached Tianhe, except for the Queen Mother's territory. Death in the south is a big angle, a photo. Go to the sky city and the festival, enter the market, and then go west ten days later; Fifty-six days are with the black dragon. " (Records of the Five Elements of Hanshu) The comet records in ancient China are accurate and reliable.

Although there is a long and systematic record of Halley's comet in China, no one has sorted it out and studied it, just some original data. To make an inaccurate analogy, just like the rough jade that Bian He, a Chu man, gave to Li Wang in the Spring and Autumn Period, needs to be carefully carved. And Harley has done such a job, so Harley deserves this honor.

Extended data:

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.

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.

References:

Baidu encyclopedia-halley's comet