8 inches per mile squared

The formula 8 inches per mile squared is often cited by flat Earth proponents as a way to calculate the supposed drop in height that should occur over a given distance on a spherical Earth. However, this formula is flawed and not a great measure squared for several reasons:

1. It assumes that the Earth is a perfect sphere with a uniform radius. In reality, the Earth is not a perfect sphere, but rather an oblate spheroid with variations in elevation and curvature.
2. The formula does not account for factors such as atmospheric refraction, which can cause the apparent position of objects to be higher than their actual position.
3. The formula does not take into account the effects of gravity, which causes objects to be attracted towards the center of the Earth and can cause the surface to deviate from a straight line.
4. The formula assumes a constant rate of change in height, which is not accurate over long distances due to variations in elevation and curvature.

Overall, the formula 8 inches per mile squared is a flawed and oversimplified calculation that does not accurately reflect the shape and curvature of the Earth. More accurate and precise measurements have been made using advanced technologies such as satellite imagery, which provide a wealth of evidence for the spherical shape of the Earth.