Guo Shoujing
Chinese astronomer and mathematician (1231–1316)
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Guo Shoujing (Chinese: 郭守敬, 1231–1316), courtesy name Ruosi (若思), was a Chinese astronomer, hydraulic engineer, mathematician, and politician who lived during the Yuan Dynasty (1271–1368). The later Johann Adam Schall von Bell (1591–1666) was so impressed with the preserved astronomical instruments of Guo that he called him "the Tycho Brahe of China." Jamal ad-Din cooperated with him.
