Echoing what
@GK said. You said my calculations were inaccurate and were not my own work (ironically you said they were taken from a reviewed source, but lets gloss over that), and you said you had calculations that proved otherwise.
Show them. What calculations have you done and what measurements have you gathered.
The earth is not a perfect globe. It is about 0.34% wider at the equator than it is pole to pole and then has mountains, valleys etc. Earth is over 12,000km across and Everest is only 8.8km heigh, so at the distance of the moon, neither of these are noticeable, making it appear to the human eye as a perfect globe.
Just traveling to other places on the planet, particularly the southern hemisphere, seeing different stars or the constellations & moon looking rotated, is one way to show we are on a big ball.