At no point in your explanation were two telescopes maintained at level and separated from each other to the point where they were out of view.
In fact I saw a lot of telescopic lense being MOVED AT ANGLES TO COMPENSATE FOR SOMETHING as they were zoomed in and out.
The "phenomenon" exists on land the same as is does on the sea BECAUSE the land is curved, not in spite of the curve.
Also, I'd be happy to see any person (And there are sufficiently wealthy "flat earthers") simply fly off the "edge" of the earth, turn around and take a picture of it.
Check out the Law of Perspectives. On a flat plain, things get smaller as you go away from it. As you zoom into the boat or a person walking on land who is far away with a stronger lens, you can see the full boat (or person). That would not be possible if the world were globe because the person would be obscured by the earth's curvature.
Here is another video that proves the earth is flat. You can do this experiment and prove we are living on a disk.
Try a 1,500 Mile laser test
Haha---if the Earth had any kind of curve---you could read it at 7.5 miles.
The green visible light spectrum of a 10,000mw Helium Neon laser is capable of putting a green dot on the moon (238,900 Miles away)
If the Earth is flat, you should be able to stand on the shore of the Bantry Bay in Ireland and produce a green dot on a sheet of wood on the coast of Atlantic City in New Jersey.
I'll even give you the offset for 200 foot ocean waves and say point your laser from a helicopter at 1000 feet altitude.
YOU WILL NOT BE ABLE TO DO IT, THE CURVE OF THE OCEAN WILL BE IN YOUR WAY
Hi Timeshiftarts--- Please address this video. They put the same green laser at 7.5 miles and it shows there is no curvature. Rather than have me go to Ireland and New Jersey---just address this video which you can see. You can see the results. No curve!
In that video, a little ways in, the narrator says "The laser started to get higher above the surface of the lake so I had them adjust it down"
The reason it got higher (without adjustment) is because the laser was pointed LEVEL across the lake which was CURVED away from the LEVEL LASER.
Your video PROVES A ROUND EARTH