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    1. A sphere is a 3d construct, so 2 isn't enough.
    2. For it to have any chance of working, with fudged projections even, the sphere would have to be quite a small one compared to our actual planet.
    1. The surface of a sphere is 2D. Non Euclidean curved space, but still 2D.

    2. The Earth does not feature in the problem.

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