So, the light should travel on straight paths (at least close enough)
Absolutely not. Electromagnetic acceleration applies.
Oh. I haven't heard that one before.
Electromagnetic acceleration? Is that supposed to change the speed, direction or magnitude of light, or several of these?
On the other hand: if light doesn't travel in straight paths to begin with, then how can "ships not disappearing" be an evidence of anything, as is claimed elsewhere?
EDIT: Actually, the more I think of it the more weird it sounds. After all, the most common argument I ever see for a flat earth is that it looks flat. That when you stand on the shoreline or on a hill or put a balloon with a camera up to the sky, you don't see the curvature. But what's the point in it? The whole concept of "things looking like they are" is based on the assumption that light travels on straight paths. And now you tell me that it absolutely isn't so.
Could someone remind me, what was the problem with the globe in the first place?