玄始历、元始历[1]是中国古代曾经使用过的历法之一,北凉太史敦煌赵𢾺著。[2][3][4]北凉、北魏于452年至522年用了71年[5]。沈约《宋书》称之《甲寅元历》,《开元占经》称之《梁赵厯》[6]。
玄始历首破章法,采用600年置221个闰月代替十九年七闰法,1太阳年=日(≒365.24431日),1朔望月=日(≒29.53060日)。之后祖冲之大明历亦循之弃十九年七闰法[7]。
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