Answer: The earliest record of Halley's Comet was left in "Spring and Autumn".

During the Warring States Period, the "Gan Shi Star Book" co-authored by Gan De and Shi Shen was the world's earliest astronomical work. It accurately recorded the positions of 120 stars. It was the world's earliest star table. Gander also discovered Jupiter's third satellite, 2,000 years before Galileo's discovery.

Paper appeared during the Western Han Dynasty. During the Eastern Han Dynasty, Cai Lun improved papermaking technology, indicating that my country was the first country to invent paper in the world.

Zhang Heng of the Eastern Han Dynasty created the world's earliest seismometer for measuring the direction of earthquakes and an armillary sphere that used hydraulic rotation;

Hua Tuo of the Eastern Han Dynasty invented the anesthetic "Ma Fei San", which is a milestone in the history of world medicine. pioneering.

The Terracotta Warriors and Horses of Qin Shi Huang are known as the "eighth wonder of the world".

During the Three Kingdoms, Jin and Southern and Northern Dynasties, Zu Chongzhi accurate the value of pi to the 7th decimal place, 100 years earlier than in Europe.

Faxian of the Eastern Jin Dynasty was the first to go to India for 14 years to seek Buddhist scriptures. He wrote "Buddha's Country". He encountered a storm on his way back to China by boat and crossed the Atlantic Ocean to the coast of present-day Mexico. This is recorded in history. The first non-American resident to reach the American continent, more than 1,000 years before Columbus.

The Zhaozhou Bridge (Anji Bridge) designed by Li Chun during the Sui Dynasty was more than 700 years earlier than similar bridges in Europe.

The "Diamond Sutra" volume printed in 868 is the earliest extant woodblock print with an exact date in the world.

The astronomer Zeng Yixing was the first person in the world to measure the length of the earth’s meridian. The Dayan Calendar he presided over was the most precise calendar at that time.

"Tang Materia Medica" compiled by the court of the Tang Dynasty is the world's first pharmacopoeia compiled and promulgated by the state.

Shen Kuo, an outstanding scientist in the Northern Song Dynasty, wrote "Mengxi Bi Tan", which was hailed as "a milestone in the history of Chinese science" by the British historian of science and technology Joseph Needham.

The movable type printing invented by Bi Sheng in the Northern Song Dynasty spread eastward to Korea and Japan, and westward to Egypt and Europe."