Biography of Guo Shoujing

 Guo Shoujing (Chinese: 郭守敬, 1231–1316), courtesy name Ruosi (若思), was a Chinese astronomer,[1] engineer, and mathematician born in Xingtai, Hebei 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."