Guo Ruosi - Peacock

…An astronomer, mathematician, and hydraulic engineer from the Yuan Dynasty. His pen name was Ruosi, and he was born in Xingtai, Shunde (Hebei Province). He studied astronomy, calendars, and hydraulics from an early age, and studied under Kublai Khan's advisor Liu Bingzhong. He served the Yuan Dynasty and participated in the hydraulics project in northern China. In 1276 (the 13th year of the Yuan Dynasty), an order to reform the calendar was issued, and he participated in research to create a new calendar together with Xu Heng, Taishiling (Director of the National Astronomical Observatory) Wang Xun, and Yang Gongyi. Wang Xun carried out theoretical calculations, and he engaged in the production and observation of observation instruments, and built an astronomical observatory (star observatory.…

*Some of the terminology explanations that mention "Guo Ruosi" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…中国，元代の天文学者，数学者，水利技術者。字は若思，順徳(河北省)邢台の出身。早くから天文暦学，水利の学を学び，また世祖フビライの謀臣の劉秉忠（りゆうへいちゆう）に学んで，元朝に仕え，華北の水利事業に参加した。1276年(至元13)改暦の命令が下り，許衡，太史令(国立天文台長)の王恂，楊恭懿（ようきようい）らとともに新暦作成の研究に従った。王恂は理論計算を行い，彼は観測儀器の製作と観測に従事し，天文台を建てた(観星台。…

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