uvas, how can you say that without knowing the observer height? There should be 780 meters hidden for a 6 foot observer. The highest peak on Isle of Man is just over 600 meters. Even at 20 meters observer height, the tops of the mountains should not be seen without favorable refraction.
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Here is a vid that shows the same part of the earth. The observer is 30 miles inland from the shore (with a known height) looking out at the mountain with the windmills in the foreground. The geometry of a flat earth would put the mountain 3 times higher than what actually appears. This is the part of the mountain hidden by the curvature of the earth.
Why reference another video instead of simply answering my question? This video is not correct as the math fails to take perspective into account. I did the math quick and the tower and mt. snaefell should appear almost exactly the same height on a flat Earth. I'll probably do a full video debunking this one soon since it's too much for the comments section on someone else's post.