What is the main contribution of Guo Shoujing, a scientist in Yuan Dynasty?

Guo Shoujing, a scientist of Yuan Dynasty in China, mainly contributed to astronomy.

Guo Shoujing made many precise astronomical observations with his own improved and created astronomical instruments, which provided reliable observation basis for the compilation of chronicles.

He engaged in and led many observation projects, such as the time of winter solstice, the distance and catalogue of 28 nights, the test of the four seas, the determination of ecliptic angle and some epoch times, most of which were the most accurate or close to the best in the ancient history of China. One of the most famous is the Four Seas Test.

personal work

Guo Shoujing once participated in the research and development of * * by Xu Heng, Wang Xun and others, and worked out the service calendar, which has been used for more than 360 years and became the most advanced calendar in the world at that time.

According to the Biography of Guo Shoujing in Yuan Dynasty, the astronomical calendar works compiled by Guo Shoujing include Tubu, Licheng, Biography of Yi Li, Shenshenxuan, Notes on the Upper, Middle and Lower Calendars, Notes on the Times, the Origin of the Calendar Reform, Elephant Style, Examination of the Twenty-Ten Scenery and Examination of the Five-Star Tour.