图中abcd为两条纬线的一部分 bec位于同一条经线上aed三点的太阳高度均为o°a和e的时差与e和d的时差之比为21读图 Template




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tomski图中abcd为两条纬线的一部分 bec位于同一条经线上aed三点的太阳高度均为o°a和e的时差与e和d的时差之比为21读图 coloring