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Go to beach.
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Set up tripod w/ camera
3.Set up drone w/ 2nd camera.
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Watch sun set at water level in camera one.
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Lift camera 2 to 400 feet and watch sun rise
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hold steady and watch the sun set again.
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RECONCILE
Thought experiment.
If this were the case (and in my example it is a fact the sun re rises in camera 2)…
It is the only experiment I know of that can be done on this planet by a single person that proves the earth is a ball. It IS round. Go see for your self. Or if you like think the thought experiment through and you will KNOW it's round. Or you could just assume based on every other object of similar size in the universe being round.
Either way, You'd be right.