I think @kidsysco shared some videos in the comment section of a fairly in expensive way anyone can decisively prove whether the earth is round or not. Now people will attack those videos, yet the point is they are inexpensive... so rather than talking Fish Eye lense and crap like that maybe they should just TRY the experiment.
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I must also note, that light may not travel in a straight line.
It may travel parallel to the ground. And thus, all of these methods would be completely useless.
A good reason that it may travel parallel to the ground is that the earth is actually curved space.
Well relativity does support the curvature of light. So that would make some sense. In fact, observing the curvature of light during an eclipse is what eventually proved General Relativity. Proved does not mean stop questioning, it was just the best explanation at that point.
And what happens when they do is people give them crap over it.
There is a program for converting fish eye images to flat, and every time its done, the earth looks flat in the resulting pictures.
Jeranism was doing work with laser over water, and found no curvature, and everyone complains that he didn't do it good enough.
Have you looked into how far light houses can be seen from?
And then put that distance into an earth curve calculator?
Sounds like an excuse to me. I haven't actually seen them try it.
Look up Jerranism's early work. Then you will see one of them trying.
And the crap he got was huge.
Sorry, I have no memory for names. I have super good memory for facts and details. So, with today's search engines, I can't find again, what I found before.
But, there are others.