( and another proof for his axiom) It's the Eratosthenes proof with just 2 sticks and a bike. If you take a photo and then horizontally (but not vertically) compress the image, the curvature is pretty easy to see against the straight spirit level (this rules out any in-camera effect).įlat earthers seem to like those kind of experiments that are performed by everyday people and simple enough to be understood without any prior knoweledge so I'd show your friend this linked video. One nice direct method is to set up a camera pointing out to a sea horizon on a clear day, preferably from a good height, then add a spirit level to the view and line it up against the horizon. Two easily verifiable contradictions of this are a) the Sun sets, and b) it never changes its apparent size in the sky, even though, according to the flat Earth model, its distance varies considerably throughout a day. Like, many of them believe the Sun is a small, close globe that circles around and shines down like a spotlight. The best you can do, I think, is to get a lot of detail about what he believes and try to find a contradiction in it.
I'm not sure a setting sun will convince him the earth isn't flat as they do seem to come up with some odd excuses to combat it.Īnd they'll keep coming up with odder and odder excuses, even ones that are patently ridiculous, rather than give up this idea that makes them feel like they're special because they know "the truth."
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