地球公转的轨道是椭圆形的,由开普勒定律可知,当地球在远日点时公转速度最慢,在近日点时公转速度最快.
当南极极夜时,地球接近远日点（7月）,公转速度慢
当北极极夜时,地球接近近日点（1月）,公转速度快
所以,南极极夜时间比北极长
不知道你明白了没有,
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