A notorious flat-earther, David Weiss, has for quite some time now issued a Kent Hovind style "challenge" for anybody to give him a single proof of a globe Earth, the prize being three bitcoin.
What is a "Kent Hovind style challenge", you might ask? It's a type of impossible-to-win challenge that was popularized by the infamous young-Earth creationist Kent Hovind: He offered thousands of dollars for anybody who would give him a proof of the theory of evolution.
The problem? Not only has he not given any description of what he would consider valid proof, but more egregiously, Kent Hovind himself is the only and sole judge of whether your proof is valid or not. Thus, it's a very easy and safe "challenge" to give: He can simply reject all proofs given to him (usually just by saying "that's not evolution") and he doesn't have to pay. Because he is the only and sole judge, he is the only person who decides whether he has to pay or not. And, of course, he will always decide not to.
And, obviously, Weiss's "challenge" is 100% a "Kent Hovind style" challenge: Not only has he given no description of what he will consider valid proof, but he himself is the only and sole judge of whether your proof is valid or not. Thus, he will never have to pay: He can simply declare your proof as invalid, no matter what it is, and that's it. Very easy and safe challenge to make.
Thus, it doesn't matter what I write here, he will never accept it and will never pay. He will just declare it invalid and that's it.
Regardless, here are a few anyway:
1) Scientists can predict solar and lunar eclipses decades and even centuries in advance, to astonishing precision. They can predict to the second accuracy when the eclipses start, when the full eclipse phase will be (and how long it will last), and when it will end. They can also predict the exact path that the shadow will make (which can very easily be corroborated, and is every time corroborated by thousands and thousands of people). They are also able to predict if it will be an annular eclipse or a total eclipse (and "how much annular" it will be), to extreme precision.
You can look up, right now, when the next solar eclipse will be, say, 20 years from now, and if you live to that time you will be able to witness its accuracy for yourself. And the accuracy will be astonishing: It will start and end exactly when they predict it, and the shadow will make a path on Earth exactly as they predict it. You can write down the exact info now, and check it 20 years from now, and you'll see that the prediction made now is correct (and was not eg. made up ten minutes before it happens).
And the method by which they do this is not some kind of huge secret and conspiracy, using dark magic and demonic powers. It's based precisely on the exact heliocentric model where the planets, including the Earth, orbit the Sun in slightly elliptical paths at very predictable speeds, according to the laws of gravity. The information and data are completely open and you can check it yourself.
You, David Weiss, cannot explain that. You, David Weiss, cannot predict a solar eclipse even five minutes before it happens, much less 50 years in advance. And your flat Earth model cannot explain it, while the heliocentric model, where the Earth is a planet among the others, orbiting around the Sun, explains it perfectly and accurately. And that's because it's what's actually happening in the real world.
2) Hurricanes always spin counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. Always, without fail. Moreover, hurricanes never cross the equator. If a hurricane would have a path that would cross the equator, it just ends up dissipating before making a full crossing.
Your flat Earth model cannot explain it. You cannot explain it. The rotating globe Earth model, however, explains it perfectly, using simple fluid dynamics.
3) During equinox, the length of the day is exactly 12 hours and the length of night is consequently also exactly 12 hours. If you are somewhere somewhat near to the equator and check which direction the Sun first appears in the morning, it will be exactly East, and if you check which direction the Sun disappears in the evening, it will be exactly West.
In your flat Earth model, however, the Sun should be first appearing on the North-East and disappearing on the North-West. That does not happen.
And you don't need any fancy equipment to measure this: It's enough to draw a line on the ground with a chalk pointing at the Sun when it first appears in the morning, and another pointing towards it when it disappears in the evening: If your flat Earth model is correct, these two lines should be at a 90 degree angle from each other. If the globe model is correct, the lines should be at a 180 degree angle from each other. The difference is so dramatic that it will be completely unmistakable and cannot be attributed to any sort of measurement error.
(Of course this doesn't have to be done exactly during equinox. Any time about that time will suffice, as the deviation from 180 degrees will be only minor.)
You cannot explain this. Your flat Earth model cannot explain this. The globe Earth model explains it trivially and beautifully.
4) Instead of filming the Sun with just a normal camera lens, which causes its brightness to overwhelm the sensors in the camera, use a filter that dims the light so that the exact shape of the Sun can be clearly seen, sharply and unambiguously, without any glare. You can do this yourself quite cheaply. Such filters are not expensive.
Then, just film the Sun raising or setting. If your flat Earth model is accurate, then the Sun should be getting smaller and smaller as it sets, and larger and larger as it raises, and quite significantly so. If the globe Earth model is accurate, then there will be almost no discernible difference: The Sun will appear to be about the same size high above in the sky, and just as it disappears behind the horizon.
Moreover, if your flat Earth model were correct, then the Sun should appear to slow down as it approaches the horizon (and speed up in the morning when it raises). However, that does not happen: The speed at which the Sun sets and raises is pretty much constant, without any slowdown or acceleration.
Your flat Earth model cannot explain why the size of the Sun does not change, or why its apparent motion is constant. The globe Earth model explains it trivially and beautifully.
Of course you will never do this easy experiment because you don't want to believe it and just want to deny its validity.
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