>>13310721The flat earth is refuted by the measurement of “how far can I see from a tower”, the law being that the distance the square root of twice the product of the height of the tower and the radius of the Earth.
The formula comes from the law of a sphere, a sphere looks like a parabola near the top,
This is true for small , it's the leading Taylor expansion of square-root. You can see as far as when the slope from your eye is tangent to the parabola. Extrapolating the tangent of a parabola from position , the slope is , this is the derivative, and it's a distance , so it's in height for the line, but you are starting below ground level, so the extra height for the tangent is Where h is how far up your vantage point is.
This law extends from ship mast-towers of 20 meters, where you can see about 10km to airliners at 10 km, where you can see things up to 250 km away. The law is very easy to check today, and it can be done by anyone from a local mountain.
you should go do this yourself, so you can trust the measurement of your own eyes
go to a mountain, take the measurement of the radius, and then see if it checks out with the official measurement
