i have heard allot about perspective. when a ship sails far enough away from a person viewing it, the ship appear to sink under the water or the ship is hidden around the curve of the earth.
here is my question. If we tie a rope between two ships and one heads west and one heads east at what point(s) would the rope become submerged due to the curvature of the earth?
In theory - with a weightless, non-stretchy rope (so it wouldn't sag in the middle) - you could indeed put two ships a dozen miles apart - pull the rope tight between them - and it would dip under the curved surface of the RE ocean - despite being perfectly straight.
In flat-earth, the rope wouldn't touch the ocean.
However, this would be an exceedingly difficult experiment to do in practice.
The idea of using a laser is kinda ok...but not really any different than just standing on one boat - looking over the horizon at the other.