二十四節氣之一 From Wikipedia, the free encyclopedia
夏至是廿四節氣裏向第十個,勒陽曆6月21號或者6月22號,就是太陽勒黃經90°箇日天,直射北回歸線。該一日天北半球頂頂日長,所以老底子個人拿立竿看日影就曉得該日頂長。後頭會一日日變得日短。
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