I've been researching flat Earth for years, and I say "yes." There is an excellent chance that all of us have been lied to for our entire lives about the vary ground we walk on. I am not smart, but there is much physical evidence that would suggest that we have been lied to for centuries about the shape of the Earth, and reality in general.
You must do your own research and stop believing what you were taught at an age where you still believed in Santa Claus, The Easter Bunny, and the Tooth Fairy.
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One thing you should understand about that equation is that it's a [i]local[/i] equation for curvature, not global. My differential geometry days are decades behind me, but I remember enough not to confuse local calculations with global descriptions.
8" per mile squared describes a parabola, not a sphere. Radius = 6378 kilometers describes the sphere, but it's harder to do local calculations with (also, due to spin, the Earth is an oblate ellipsoid). And NEITHER equation describes the mountains and valleys etc. The first is a local idealization; the second a global idealization.
This ellipsoid is a better approx than a sphere Geographers use an equation called "the Geoid" to more accurately describe the Earth's gravitational equipotential surface, so it kinda takes into account large masses like mountains. I believe it's often expressed as a sum of several hundred terms of spherical harmonics, so it's not easy to digest.
Geoid greatly exaggerated More info on geoid: [b]https://enterprise-insights.dji.com/blog/geoid-vs-ellipsoid[/b] [b]http://icgem.gfz-potsdam.de/ICGEM-Report_2011-2015.pdf[/b]
