born 602, Qizhou, Yong county, China
died 670, Chang'an
Chinese mathematician and astronomer.
He was given a position in the Imperial Astronomical Bureau in 627 following his critique of the Wuyin calendar. He became the deputy director of the Imperial Astronomical Bureau about 641. He participated in the compilation of the official histories of the Jin (265–420) and Sui (581–618) dynasties, writing the chapters containing historical outlines of Chinese astronomy, astrology, metrology, and a mathematical theory of music. In 648 he became the director of the Imperial Astronomical Bureau, and he coedited a collection of mathematical treatises used as manuals in the Mathematical College of the State University. Later he prepared the Linde calendar, which was promulgated in 665 and used until 728.