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如何画晨昏线
更新时间: 2020-09-16 00:00:00  

晨线与太阳光线垂直。过地心做一条与太阳光线的平行线,然后做这条平行线的垂线即可。

晨昏线即晨昏圈,指地球上昼半球和夜半球之间的分界线,是地球的大圆圈。春秋二分,全球昼夜等长;冬夏二至,它同经线交角最大,全球昼夜长短差值最大,由于大气折光作用和太阳视半径的存在,它实际上比大圈略小。

关键词: 如何 晨昏

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