太阳高度角
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夏至的“至”，不是到来的意思，而是……
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6月21日， 是今年的夏至。 夏至的“至”是什么意思呢？ 是到来的意思吗？ 其实， 这里的“至”指的是“极、最”， 强调的是天文意义上的极致。 “极致”， 其中又有两层含义： 第一…
