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Since you can see the curvature of the earth you can also prove it’s round. Big bonus.

Everyone knows they have specially shaped cockpit glass that warps your FOV to give the appearance of a round earth.

/s

Well, you only see that it's bent - you don't go all the way around. Might as well be an upside down wok pan.

Would that be the half-flat theory? ;)

Nope. It's the shell of the turtle.

It's 4 elephants on a turtle swimming through space.