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为什么夏天昼长夜短
更新时间: 2021-02-17 12:14:36  

1、因为太阳直射点的移动。夏季时,太阳直射北半球,直射点向北移,北半球的白昼范围变大,于是白天长黑夜短。

2、冬季时,太阳直射南半球,直射点向南移,北半球的白昼范围变短,也就白天短黑夜长了,此时南半球却是夏季昼长夜短了。

关键词: 为什么 夏天 昼长夜短

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