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So, multiple laser experiments have conducted at distances of over 20 miles.  But the typical Globetard "argument" (aka gratuitous assertion, a deus ex machina to solve all problems) is that it's refraction.  Dr. John does all the math and science and rules out refraction.  And what destroys refraction 100% is that he had lasers pointing in both directions.  In order for refraction to magically bend laser perfectly along the curvature of the earth, there would have to be an continually increasing density gradient along the path of the laser.  But that would mean a continually decreasing density gradient in the opposite direction, which would cause the laser to refract upward.  Both lasers were spotted across from one another.  Toward the end of this video he also does the math and experiments demonstrating that the vacuum of space should in fact rip the atmosphere off the earth.



With lasers going in both directions, and able to be spotted on the opposite site, refraction is literally dead in the water.

This video starts with his debunking of a guy who tried to disprove him by creating pressure differences using sugar in a water tank.  He's not demonstrating anything that everyone doesn't know, that light refracts downward when hitting a denser medium.  But Dr. John explains that there's no such density difference when the light travels through a single layer (vs the different layers of the sugar-water tank).  After the slides, there's video of the complete experiment.

Here's the video.  As I said, it's also worth watching his vaccuм of space vs. atmosphere argument at the end.  Throughout he takes meticulous readings and measurements and shows all the math.  He invited and had observers present and livestreamed the videos on Youtube.

Enjoy the video.  It requires some patience, as some slides go by a little too fast and you might have to pause to read the entire slide.  After his debunking of "Mr. West", he shows the videos of the two-way laser experiments with all the measurements and math, with video being livestreamed from the both locations simultaneously.



He is an obscure figure because a lot of people don't have the patience to follow all the math, and he isn't as charismatic as some of the others, nor does he do a great job of promoting his channel.  He's a scientist and not a social media guru.  He doesn't even have "Playlists" for his videos and his channel is impossible to find.  But it's the best and most thorough stuff out there about Flat Earth.

Here's his channel.
https://www.youtube.com/channel/UCrV1BQhaufM-PsEtMjjehDQ/videos

In order for refraction to magically bend laser perfectly along the curvature of the earth, there would have to be an continually increasing density gradient along the path of the laser. 

Not so. If the density gradient is as a result of altitude (e.g the air is thinner the higher you go), it would apply the same in both directions. When you look off into the horizon, you're looking at less dense air since, despite it being at eye level, it's actually higher off the surface as the Earth falls away beneath it. 

Or that's the globe explanation at least. I haven't looked into either model enough to have a strong opinion about which is true.

It's just a round earther, "order of magnitude" distance calculation error... what's the big deal ?

Well, theoretically, it COULD be ... just by maths (to use the British term) alone.  If the earth had a circuмference 10x bigger than we've been told, then the earth curve would allow for these distances.  In either case, modern science is debunked.

It's been driven by an atheistic agenda for hundreds of years, and they built a mathematical fantasy land (as Tesla characterized it) to the point where now even Kaku admits that they're off by a factor of 10 to the 28th power.