Gravity is a fundamental force of nature that exists between any two objects with mass or energy. It is the force that attracts objects towards each other, and it is responsible for many phenomena that we observe in everyday life, such as the falling of objects and the motion of celestial bodies.
The strength of the gravitational force between two objects depends on their masses and the distance between them. The greater the masses of the objects, the stronger the gravitational force, and the farther apart the objects are, the weaker the force.
The measure of gravity is typically expressed in terms of acceleration due to gravity, which is denoted by the symbol "g." Acceleration due to gravity is the rate at which an object falls under the influence of gravity, and it is dependent on the mass of the object and the strength of the gravitational field.
On Earth, the acceleration due to gravity is approximately 9.8 meters per second squared (m/s^2), which means that an object in freefall near the surface of the Earth will accelerate at a rate of 9.8 m/s^2 towards the Earth. However, the value of g can vary slightly depending on factors such as location and altitude.
The measure of gravity is important in many fields of science, such as physics, astronomy, and geology. It is used to calculate the trajectories of objects in motion, to determine the mass and composition of celestial bodies, and to study the structure and composition of the Earth's interior.
Overall, the measure of gravity is a crucial concept in our understanding of the universe, and it plays a fundamental role in many aspects of our daily lives.

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.