(北纬2°33’)这天的白昼达11小时59分,海口市约为10小时55分,杭州市为10小时12分,北京约9小时20分,而号称“中国最北端”的黑龙江省漠河县(北纬52°58‘)也仅有7小时34分。冬至过后,夜空星象完全换成冬 ...
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