Wow good detailed technical research. It is strange that we act with a presumption of a flat earth in our technology, and it works perfectly on an apparently globular earth. One would think that it wouldn't work. If a globe earth acts the same as a flat earth then.... Science has some explaining to do.

The U.S. Air Force is also on record implicitly admitting that the earth is flat. The Systems Engineering Branch, Flight Determination Laboratory of the United States Air Force prepared a technical memorandum in 1953 titled: Atmospheric Refraction Errors for Optical Instrumentation, Preliminary Report, Technical Memorandum, No. 104. That technical memorandum, which has since been declassified and posted on the U.S. Department of Defense Technical Information Center website, contains the following warning:

This document contains information affecting the National Defense of the United States within the meaning of the Espionage Laws, Title 18, U. S. C., Sections 793 and 794. Its transmission or the revelation of its contents in any manner to an unauthorized person is prohibited by law.

What is so secret about atmospheric refraction that revelation would be a national security concern?

Notably, the formulae in the technical memorandum were constructed assuming the validity of a flat Earth.

In the present comparison of the relative air masses at various elevation angles for flat and spheroid earth, no account is taken of the slightly curved path followed by radiation arriving at a given angle.” 12 Why would the publication present two different formulae, one for the flat earth another for a spherical earth, and then disregard the spherical earth formula? “[a] flat earth assumption, then, may be safely used for total angular refraction down to about 7° elevation.” 13 When it really counts, as when designing missiles, the military assumes that the earth is flat.

The U.S. Government implicitly acknowledged the reality of the flat, stationary earth in another official publication. In NASA’s 1988 publication (#1207) titled Derivation and Definition of a Linear Aircraft Model, it states that the generally accepted linear aircraft model is based upon “a rigid aircraft of constant mass flying over a flat, nonrotating earth.”

The FAA publication explains that in order for the software to accurately replicate the behavior of aircraft during flight over the earth, the software running the TGF simulator assumes that the earth is flat.

Notice that the FAA document both assumes a flat earth and ignores the rotation of the earth and gravity. The FAA maintains that the computer model assumes a stationary, flat earth and at the same time remains precise and accurate regarding the flight of aircraft. The only way that a stationary, flat earth can be the basis for a model, and that model still be accurate, is if the earth is in fact flat and stationary. That means that the ignored gravity and rotating, globular earth do not affect the accuracy of the model, because they do not in fact exist in reality.

The models that the testing validated as being faithful to reality to a high degree of confidence assumed a flat, stationary earth. That means that the FAA verified, through actual testing with aircraft, with a high degree of confidence, that the earth is flat and stationary.