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祖冲之,字文远,范阳浚遒县(今河北涞源)人,是我国南北朝时杰出的科学家。祖冲之从小就对日月星辰等天象产生了兴趣。他从天文到历法,从数学到机械制造,研究范围甚广。他求得的圆周率值.先于西方国家一千多年。他编制的大明历很有创造性,是当时最好的历法。为了实施大明历,他坚持真理,不畏权势,与保守派戴法兴作了不懈的斗争。当时,由于保守势力的强大,他的大明历未被采用。但是,真理是不能被湮没的,在祖冲之去世十年之后,他的大明历终于颁行于世。