Read the FAQ, the Wiki and ENAG
So far the FAQ and the Wiki only attempt to show how the earth could be flat. only ENAG tries to prove it, and it fails.
for sport, let take the bit in ENAG about polaris for example as to how it even fails at showing how the earth could be flat.
ENAG says that the reason why you see Polaris going to the horizon is due to perspective. This is idiotic. Polaris is approximately above the north pole, so it is on a line normal to the surface of the Earth. with modern science, we know that polaris is 430 light years away from Earth. If we were to stand at the flat earths equator (a couple of light miliseconds) the difference in perceived angular position would be monumentally small. even if we were to ignore the 430light year figure (which would be circular reasoning to do so) lets work the problem with a very reasonable number, say 3000km. the FE distance from pole to equator is 10,000km. So, if the opposite leg of our triangle is 3000km, and our base leg is 10,000km, then the apparent angle in the sky is Arctan(3/10) which is over 17degrees.
This is one of many examples of how he brings up phenoma to explain contradictions, but fails to verify the plausibility