No, but as long as he is somewhat respectful, I will try to be as well.
Fair enough.
Even though, the flat earth model is false, racerunner is on the right track, as well as other flat earthers, who question the shape of the earth.. Why do I say this?
Well, the ocean, or large bodies of water, make for a really good way, if not the only way to measure the earth's shape, for the average person. Water will generally be sculpted to shape of the earth, unlike dirt, and rock.
The Concave Hollow Earth has some history in Florida, and I find it funny, that I started believing in it, while living in Florida. Anyways...
The U.S. Geodetic Department did a survey on a lake in Naples, Florida. They found that the water goes uphill in both directions, after conducting the survey.
"The United States Geodetic Survey crew for two years conducted further experiments, among them measuring the surface of a long lake in Florida on the theory that water conforms to the true curvature of the Earths surface regardless of how the land may be, thus giving a true level only to find that the water curved uphill in each direction rather than downhill."
The above was a quote from a college website, but it was taken down, but it can be confirmed other places on the net. The survey was done in 1896 and 1897. I actually contract NOAA to see, if I can find the survey, but was directed to a database, in which I couldn't find it...Sadly.
There was a commune of a Christian religious group, who believed in a Concave Hollow Earth, led by Cyrus Teed. He led a team to confirm the shape of the earth, by using the Rectilineator.
Someone might be asking, who cares? Well. there is a point. By running your own experiments and seeing the outcome, you can prove your point, instead of relying on third party evidence, which may, may not be true. There is no way to replicate NASA's proof, for the average person.
So, despite what anyone thinks, these seem to be the two best ways, of proving shape of earth, with a lake being the better of the two.
Both the Rectilineator and U.S. Geodetic survey pointed to a Concave Hollow Earth. There is also the Tamarack mind shaft experiments using magnets, that proved the center of earth was, 4,000 miles up, not 4,000 miles down.
One could say, I challenge these results. Well, the water survey is about the easiest to do, which I will be conducting myself, to confirm the results. The Rectilineator could be redone, but it would take a large budget, or possible redesigned to make it cheaper, and quicker. The Tamarack mind shaft experiment could be redone, but that would be extremely difficult, due to liability, and finding similar mine shafts.