Everybody knows that NASA document considering the Earth as flat and stationary. Flerfs, knowing nothing about how models work in physics and engineering problems, rejoiced. For them, it was NASA admitting that the Earth is flat, when in reality it was just a simplified model that worked well enough for the problem being considered. It's the same thing when you ignore friction, or air resistance, or when you consider cows as spherical.
Anyway. There's another document that considers gravity and treats Earth as a sphere:
This paper focuses on the sphere and ellipsoid shape models that are commonly used in modeling the Earth. Higher order shapes can provide improved modeling for the Earth but are not in common use among vehicle simulation products. This paper does not examine modeling the Earth as a plane, i.e. the “flat Earth” model. The “flat Earth” model maintains surface fidelity over small distances.
Flerfs, any thoughts?
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