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《周髀算经》唐 李淳风 古籍古书网盘下载
《周髀算经》是算经的十书之一。约成书于公元前1世纪，原名《周髀》，它是我国最古老的天文学著作，主要阐明当时的盖天说和四分历法。唐初规定它为国子监明算科的教材之一
