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【引用】“三伏天”是如何确定的?

2011-08-05 15:56:11| 分类：默认分类 | 标签： |举报 |字号大中小订阅

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本文转载自乘成《“三伏天”是如何确定的?》

　俗话说“热在三伏”,三伏天是一年中最热的时候。据气象专家介绍,今年入伏的时间是7月14日,头伏长10天,中伏长20天,8月23日出伏,“三伏天”一共40天。

“三伏天”是按照我国古代的“干支纪日法”确定的。每年夏至以后第三个庚日(指干支纪日中带有“庚”字的日子)为头伏,第四个庚日为中伏,立秋后第一个庚日为末伏,合起来称为三伏。头伏、中伏和末伏又称初伏、二伏和三伏。

“三伏天”的长短并不是固定的,初伏、末伏各10天,而中伏有的年份是10天,有的年份是20天,这就导致了“三伏天”有的年份是30天,有的年份是40天。

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