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固定有30,没有大、小月之分。一年共有3季,每季4个月,因此名义上一年只有360天。但每年新年前都会加上5天,叫做Epagomenal Days,在这5天,他们会举行仪式庆祝新年。就这样,两个新年实际上相隔的日数便为365天。

古埃及人没有闰年的概念。地球绕日公转一周需时 365.25 日,没有了闰年,4年后日历就会比实际天象(例:黎明前看见天狼星东升)早一天;1460年后便会提早整整一年(又会和实际天象一致)。这1460年,古埃及人称为天狗周期英语Sothic cycle,“天狗”正是埃及人眼中的天狼星。


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