下图为地球上两条相交的弧线交点为ab一条ab为北半球某纬线的夜弧部分另一条ab为晨昏线的一部分a的经度为1200eab的经度差为 Template




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tomski下图为地球上两条相交的弧线交点为ab一条ab为北半球某纬线的夜弧部分另一条ab为晨昏线的一部分a的经度为1200eab的经度差为 coloring