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True Earth 101: Curvature

A mirror has to be flat to give a true reflection.  We often see crystal clear perfect reflections in bodies of water.  That means this water must be flat.  For the globe model to be true, bodies of water must curve.

Microwave communications happen over distances that should be blocked by the curve of the earth, if the earth were really curved.

https://www.youtube.com/watch?v=nJenY3zKWLs

 

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