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開禧曆

開禧曆》,是中国古代曆法南宋使用的第七部历法,屬於陰陽曆

宋宁宗开禧三年(1207年),鲍澣之修成。从开禧四年(1208年)颁布施行。岁实(回归年)为=365.24307692日,朔策(朔望月)为=29.53059171日,岁差约为六十七年多差一度。《開禧曆》上元甲子距开禧三年(1207年)丁卯积7848183岁。《宋史》没有记载《開禧曆》上元冬至宿度,也没有记载冬至日躔所在。《中兴天文》称:“开禧占测冬至,巳在箕宿。”《開禧曆》墨守何承天之法,不知岁实有减少之势,在制订此历时反倒是增加岁实。取法的近点月日数太强,惟交点月日数稍密近,步五星也精切。精确不如《統天曆》。宋理宗淳祐十一年(1251年),被《淳祐曆》取代。

参考文献

[编辑]
  • 《宋代文化史大辞典》
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開禧曆
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