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景初曆

景初曆》是中国古代曆法东汉魏晋的天文学者楊偉編纂,屬於陰陽曆

魏明帝景初元年(237年)施行。採十九年七閏法,1太陽年=日(≒365.24688日),1朔望月=日(≒29.530599日)。1近点月=日(≒27.55451日),确立月食開始時刻的推算方法。[1]

晋朝建立後,泰始元年(265年)行泰始曆就是景初曆[2]。用至南北朝劉宋用到444年,被《元嘉曆》取代。北魏用到451年,被《玄始曆》取代。

文內注釋

  1. ^ s:晉書/卷018
  2. ^ s:晉書/卷017 武帝踐阼,泰始元年,因魏之《景初曆》,改名《泰始曆》。
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景初曆
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