Explore the Earth's Curvature 

Show how the Earth's curvature affects paths on its surface.

Define a path that starts at the Eiffel Tower and travels 100 km along geodesic lines in each of the four compass directions in turn.

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Draw the four path segments and zoom in to verify that they do not close due to the Earth's curvature.

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Find the distance between the start and finish points.

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Now follow loxodrome segments (curves of constant rhumb) instead of geodesics.

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The latitude of the final point coincides with that of the beginning, but not its longitude.

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Find the distance between the start and finish points.

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