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ZHANG Yuzhe (Y.C. Chang) (1902-1986), born in Minhou, Fujian Province. He was educated in Chicago University from 1923, got his doctorate there in 1929, and returned to China in the same year. From 1941 to 1984, he served as the director of the Purple Mountain Observatory (emeritus director from 1984 to 1986). He was engaged in the observation of the asteroids and orbital determination.