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.

This is an interesting claim however it is not the case and clear evidence contradicts the claim.

"Millions of photographs of our planet show that water adheres to the Earth's surface, disproving the claim that the Earth is flat. Waterfalls and rivers that follow the curvature of the Earth's surface further debunk claims that gravity is fake.
Even on an unlevel surface, water in small amounts will have a curved surface due to surface tension. Although it may appear flat, it is an anomaly in the brain's perception compared to other irregular surfaces.
Observing the horizon from the beach provides further evidence of the Earth's curvature. The horizon appears to be a straight line, but it is actually the curved edge of the Earth's surface as it disappears from view. This can be seen more clearly from higher altitudes, such as from an airplane or from space.
Additional bullet points:

• The Earth's curvature has been measured and confirmed through various scientific methods, such as satellite imagery and the observations of astronomers and navigators.
• The phenomenon of gravity has been extensively studied and observed, with a vast amount of evidence supporting its existence and effects on the behavior of matter in the universe.
• Flat Earth theories and conspiracies lack scientific evidence and do not account for the vast amount of data and observations that support the spherical shape of the Earth."