Originally posted by Scoutman03
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This is very simple to prove. Go take a flat dinner plate out of your kitchen and look at it obliquely as if you were aboard an aircraft or a high-altitude balloon. Now look at the edge of the plate and you will see - curvature.
Also keep in mind that what you see is dependant on the light from the sun and which direction it's coming from. The sun will always cast a curved beam - just like a flashlight.
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