I encourage you to do an experiment.
Go to any ocean with a boat, two people, two levels, and two telescopes.
Put one person on the boat with a telescope and one on the shore with a telescope. Use the level to ensure that the telescope is exactly level (pointed along the "flat" plane of the Earth)
If the Earth is flat; if water, which seeks it's own level, does not curve with the Earth; then the person on the boat and the person on the shore will NEVER lose sight of each other no matter how far out to sea the boat travels. If, however, the Earth is curved the view will gradually skew until neither of you can see each other at all.
This experiment is simple, relatively cheap, and repeatable.
Attach a camera to your scope that shows the level bubble remains level. If you can do this and travel 200 miles from shore without losing sight of each other (or skewing the level) I will admit you have a viable theory. I'm certain you cannot.
Timeshiftarts---these kinds of experiments have been done and prove over and over again the Earth is a flat plane.
In the 1800's check out the French experiment by Biot and Argo. They put a powerful lamp on the summit of Desert Las Palmas and it would shine on Camprey 100 miles away. The two points are exactly the same altitude. If the Earth were a ball with 25,000 miles in circumference, the light would have shone 6600 feet below Camprey. It did not. It shone at the same spot.
These experiments have been done many times with bullets as well.
Bullets fall along the curve of the Earth with gravity.
In the 1800's a "powerful light" could only shine on an object a hundred miles away, not near enough to reflect a curve over 5,000 miles (today you could use a laser that makes a flat line across thousands of miles)
I suggested using the OCEAN fo your experiment because the ground has terrain. Supposedly a "flat plane" would mean a "flat ocean"
Check out this video explaining how your experiment is routinely disproven.
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!