2012 Guo Shou-Jing is a commemorative coin issued by China to celebrate the 700th anniversary of the death of Guo Shou-Jing, a prominent Chinese astronomer, engineer, and hydraulic engineer during the Yuan Dynasty. Guo Shou-Jing is best known for his work in astronomy, especially for creating the "Shoushi Calendar," which improved the accuracy of the Chinese lunar calendar. He also made significant contributions to water conservancy projects and agricultural irrigation systems.
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