Everything requires magical mind bending to work on a globe
(media.scored.co)
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It would have been nice to see the actual pictures of the lighthouses at that distance. It also depends what vessel you're observing them from - if it's a cargo ship deck you're up 20m above sea level.
But here's my defeater: if the Earth was flat why do ships have crows nests up on the mast? Wouldn't people be able to see at the same distance from the deck? Were all shipbuilders in on the conspiracy for the past thousand plus years?
You can do the calculation or use a curve calculator and it will show you that most lighthouses would be behind the curve even 20 meters above sea level. The globe religion is dying fast.
Ok but how do I verify they are visible? I can't go to open see to do that.
See the edit.
Getting up high will allow you to see farther on a flat plane, that is why they have crow's nests. Not to see over some imaginary curve.
If you really want to know how vision and perspective work then watch this. It's intense.
Angular Resolution and our World
https://odysee.com/@stpierrs:f/Angular-Resolution-and-Our-World-(720p_30fps_H264-128kbit_AAC):f
That doesn't make sense. On a flat plane there's nothing below horizon no matter where you stand - you'll just get a different perspective of the objects, but if there are no obstacles and clouding you'll be able to see the shore even if you're in the middle of the ocean (provided there is no fog and waves which seems impossible).