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58问答库 > 问一下怎么判断这图是北半球还是南半球？怎么知道哪条为零经度？

问一下怎么判断这图是北半球还是南半球？怎么知道哪条为零经度？

2025-04-02 03:46:00

推荐回答（1个）

回答（1）：

由右图得知a地6点日出18点日落，由此可知改日为春秋分或该地位于赤道，但根据该地该日正午太阳高度角为30度排除位于赤道，即改日为春秋分。
春秋分太阳直射点位于赤道，赤道正午太阳高度角为90即左图中中心点，可知该图中心点以北为北半球以南为南半球。
根据日期分布可知图中阴影与非阴影分界线为180度经线，图中最左侧点所在经线为0时经线，则北京时间为2点。
你说的零经线是0度经线吗？那自然在180对面

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