What are the main contributions of Guo Shoujing, a scientist in Yuan Dynasty?

Guo Shoujing, a scientist of the Yuan Dynasty in China, made great contributions in astronomy, geography, water conservancy, mathematics and physics (optics), as follows:

1. Mathematics: The calendar method in which Guo Shoujing participated not only made progress in astronomical data, but also made great creation and innovation in calculation methods.

2. Optics: Guo Shoujing has repeatedly used pinhole imaging principle in astronomical instruments such as landscape symbols and pendulums, which is also an outstanding achievement in the history of optics in China, and reflects the high application ability of ancient optical knowledge in China.

3. Water conservancy: In the process of water conservancy, Guo Shoujing has always implemented the trinity of irrigation, flood control and water conveyance, and achieved good results.

4. Astronomy: Astronomical Observation in Chronicle Guo Shoujing made many precise astronomical observations with his own improved and created astronomical instruments, which provided reliable observation basis for Chronicle.

5. Geography: put forward the concept of "altitude"; Make astronomical instruments.

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