How would you prove that the earth is round? This could be about quite a few things, but specifically, earth as flat versus, earth is round. How do we it has curvature whatsoever? And has the spheroidal characteristic)? While you can measure the curvature of the earth using many different means, but one of which is to measure the properties of shadows at different points on the earth's surface. But they'll be always perpendicular to the earth if the earth is flat. We observe that shadows at different places cast different lengths,. and that's been known since the time of aristophanes two thousand plus years ago. The earth orbiting around the sun, that's only been

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