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数伏从哪一天开始

更新时间: 2020-11-11 00:00:00     

数伏的时间是按照农历来计算的,每年入伏的时间不固定,中伏的长短也不相同。因此,“夏至三庚数头伏”也就是从夏至开始,依照干支纪日的排列,第3个庚日为初伏,第4个庚日为中伏,立秋后第1个庚日为末伏。庚日出现的早晚将影响中伏的长短,当夏至与立秋之间出现4个庚日时中伏为10天,出现5个庚日则为20天,也由此出现有些年份伏天共30天,有些年份伏天共40天的情况。

关键词: 开始

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