Chew said: Tell those yahoos to back up another 20 miles and try it again. Click to expand...

Trailblazer said: why is there a "horizon" at all, if the Earth's is concave? Click to expand...

sharpnfuzzy said: There is a fairly simple experiment that you can do that shows the curvature of the earth and lets you see the sun set twice in one day. Click to expand...

tadaaa said: can't you just say you have stood on top of Mount Everest, and the Earth does indeed curve Click to expand...

Mick West said: If they think this is evidence, then why don't they do 100 miles, at 3 feet elevation? Click to expand...

Mick West said: And given that there are literally millions of combinations of locations in which you could do this simple experiment with a telescope Click to expand...

Mick West said: Arguing with flat earthers (or concave earthers) is generally a waste of time. Many of them are essentially just trolling - arguing a case as a funny intellectual exercise. Then there are some who take it more seriously who use the work of the first group, but often don't really understand it. Click to expand...

Soulfly said: I have seen these videos before but didn't think to suggest it here as an experiment to prove the Earth is not flat. Click to expand...

Thanks all for the responses!!Well, their laser diffuses much more at that distance. But I think their 20 mile example deserves explanation.The concave simulations I've seen dont reflect the actual dimensions concavers describe. They claim the glass sky is 100 km up, but the animations depict more like a 3500 km altitude. The Sun is a dome shape with a black backside, and is about 140 km in diameter. That means the Sun is wider than the distance between the Earth and glass sky, and only a few dozen kilometers from the ground.So here's a brief, rough, preliminary interpretation I rendered (I think I am the first debunker to bother). It raises many questions, and I'm sure I will be corrected. I left out the 2nd glass sky inside somewhere, I am not clear on.Unlisted link-One thing I wonder is how solar flares would not wipe us out.The "bendy light" thing is a convenient catch-all explanation for why Earth looks convex. It's like explaining how an apple can look and feel exactly like an orange, when a simpler explanation would be that it actually is an orange. But I have not seen a clear illustration of how bendy light supposedly works. The Sun would still have to set and rise UP behind the edge of the glass sky, instead of DOWN below the horizon. I dont see how they can explain that away.Actually, the 'double sunset' should also occur if the Sun were setting below the edge of a flat Earth, which it cant do in FET. And they can never logically defend the "spotlight" sun hypothesis. But concavity dictates the Sun revolving inside Earth.I understand that Earth curvature only barely becomes noticeable at about 70,000 feet.Haze tends to obscure at that distance, their Radioshack lasers dont go that far, and their consumer cameras dont zoom so far, and that may be difficult to arrange. But thats why I posted examples of Toronto well below sea level at 30+ miles off. But they harp on these laser and visual experiments.It is a legitimate question, why objects are visible when they should be physically behind the 'hump.' An easy explanation is "refraction" "looming," but I was hoping to be more specific about how it is normal to expect refraction to 'subtract curvature height by Y amount, over Z distance,' that adequately and clearly explains their examples.As I mentioned, I read that surveyers use a rough 7%-rule for refraction, but that does not seem to explain this 20 mile example.There are several other such daytime video examples. One that may be more clear, uses a camera about 1 ft above sea level that can clearly see a ferry at 6.6 miles away, which should not be possible due to curvature over geometric line of sight.Again, I was hoping to find a more specific explanation than just "refraction is doing something."Individuals vary in commitment to the idea. Some really take the whole friggin' denial bakery. But I do get thru to some, or at least get them doubting. I find that most are religious fundamentalists, struggling to force Earth back to the center of an anthropocentric universe. It is truly depressing to see thousands of subscribers to the prominent flat/concave advocate channels. Since 97% of the pro-comments are riddled in spelling and grammatical errors, I suspect most are teens.I cannot debunk one conspiracy without having to debunk several overlapping ones. NASA must be lying for 50 years. And the 'fake' Apollo landings were just a distraction for the government killing JFK. I point out 50+ other space agencies around the globe, then they claim something about Illuminazi-jewmasons, CIA-NWO, reptilian, trilateral, whatever. If I debunk all that, in short order someone claims Satan is behind it all. And since god made Satan, I have to ultimately debunk god. This is how it goes.Those numerous high-altitude balloon videos are not useful evidence since they all use a wide angle lens with considerable barrel distortion, so everything looks curved. The highest I've seen is 120k feet. Thats why I link to the Soyuz Launch Camera, or the recent Space X launch. Those are the only somewhat continuous shots I found of a camera traveling from the ground to space.