If heliocentricity were true, Earth would be constantly accelerating toward the sun, and hence we would be able to feel it, as a race car driver on a track. That we can't shows that we're not moving, and heliocentricity is false (therefore, Earth is either a stationary ball - geocentrism, or flat).
IOW you don't have a proof of flat tertiary topology. you have an observation about scale and about animal psychology.
this is actually a calculation we did in elementary physics 201 ((because it's not like you have some news flash that no one ever thinks of; it's well-known & elementary among anyone educated in physics)). to counter-balance the forces due to the rotation of the earth and the orbit of the sun, a 2-meter tall person should lean toward the east something on the order of an hundredth of a degree.
so the real question is whether you can tell ((without measurement apparatus)) if you are standing perfectly vertical relative to gravity to an accuracy of thousandths of a degree?
just how good is your physical inner ear, really, at determining reality, hmm?
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