Is the earth flat?

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How about eclipse and what not.

Again you are going back to visual phenomena, which is different from physical tangible phenomena. And looking at the sky to prove the shape of the ground beneath your feet.

The first eclipses were predicted on flat earth models:
http://astronomy.swin.edu.au/cosmos/a/anaximander
http://practicalphysics.org/thales-model-universe

All you really need are the physics of water to see through the veil.