摘要
调日法是中国古代长期用于天文历算的一种分数近似法,为刘宋时代天文学家何承天所创。李锐对历史上数十部历法的日法朔余推演考证,悟得调日法的真谛在于“累强弱之数,得中平之率”,是通过分数的加成运算直接给出所求日法朔余的方法。在解读原文的基础上,对其思想进行了一定的探究。同时给出天算史家对李锐调日法的评述,希冀对其思想有更清晰的认识。
The method for regulating the day-ratio is a fraction approximation one applied in astronomy in ancient China, whose true feature is revealed by Li Rui＇s method of weighed addition of majorant and minorant numbers. Based on a study on the original article, commentaries of astronomers on Li＇s thought are presented in hope that Li＇s thought can be much clearly understood.
基金
国家自然科学基金(10471111)
吴文俊丝绸之路天元基金会项目
关键词
李锐
调日法
日法
朔余
Lirui
regulating the day-ratio
majorant number
minorant number
