Jia Sixie: Agronomy.
Li Daoyuan: The field of geography.
Zu Chongzhi (429-500) was born in Wen Yuan. Jiankang (now Nanjing) was an outstanding mathematician and astronomer in the Southern and Northern Dynasties.
Zu Chongzhi studied natural science all his life, mainly contributing to mathematics, astronomical calendar and mechanical manufacturing. On the basis of exploring the accurate method of pi pioneered by Liu Hui, he first calculated the "pi" to the seventh place after the decimal point, that is, between 3. 14 15926 and 3. 14 15927. His "ancestral rate" has made great contributions to mathematical research. It was not until the 6th century A.D./KLOC-that the Arab mathematician Al Cassie broke this record.
The Daming Calendar written by him was the most scientific and progressive calendar at that time, which provided a correct method for future astronomical research. His main works are In the Frontier, Composition, Explaining Words, Li Yi and so on.
Jia Sixie (xié), born in the Northern Wei Dynasty, the late Northern Wei Dynasty, the Eastern Wei Dynasty and the Southern Song Dynasty to Liang Dynasty (6th century A.D.), was an outstanding agronomist in ancient China. The Book of Qi Yao Min systematically summarizes the experience of agricultural production, grain processing and storage, wildlife and other aspects in the middle and lower reaches of the Yellow River before the 6th century. Linzi District built a museum in the 10,000-mu agricultural demonstration park of Zibo Qicheng Agricultural High-tech Development Zone to commemorate his great contribution to mankind.
Li Daoyuan (about 470-527) was born in Zhuozhou, Fanyang (now Zhuozhou, Hebei). Geographer of Northern Dynasties and Northern Wei Dynasties. My career was bumpy, but I didn't do my best. He has read many rare books. When I was young, I went to Shandong with my father to seek waterways. Later, he traveled the Qinling Mountains, north of Huaihe River and south of the Great Wall, inspected rivers and ditches, collected relevant customs, historical stories and myths and legends, and wrote 40 volumes of notes about water mirrors. The writing style is meaningful and vivid, which is not only a colorful geographical work, but also a collection of beautiful landscape prose. It can be regarded as the pioneering work of China's tourism literature, which has a great influence on the development of later tourism prose. In addition 13 local chronicles and 7 appointments have been lost.