[goatlover]

> Even for the flat Earth theory it's hard to dismiss it offhand. > I mean sure there are plenty of experiments you can do to show that it is pretty close to a sphere. But who do you trust to do those experiments?

All the various people who have done them, some of which can be repeated by anyone motivated enough, and all the technology that relies on it being the case. This was known to the ancient Greeks. One even calculated the circumference within a reasonable accuracy.