图中圆o1圆o2圆o3分别为某日三个时刻的80°等太阳高度线太阳直射点的纬度变化忽略不计其中n为纬线此时北京昼长夜短.读图 Template




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tomski图中圆o1圆o2圆o3分别为某日三个时刻的80°等太阳高度线太阳直射点的纬度变化忽略不计其中n为纬线此时北京昼长夜短.读图 coloring