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Don't get caught up in his
Reductio ad absurdum.It's my quest from now on to convince notbatman to stop believing in nonsense and accept that the earth is not flat.
OK you can start by proving the Sun's rays hit the Earth in parallel. You claim Eratosthenes theory is correct, now fucking prove it!
Here are some of the points that mess with your idea of the sun having or not having parallel rays, and with your picture, above, which I re-posted below. Let's look at the picture, first.
1. In the picture, the rays that look like they are straight down near/at the center of the picture, really are not. Rather, they are slanted towards the camera, but maybe away from it. They look straight down because the slant towards/away-from the camera isn't apparent.
2. Further on #1: Assuming the picture was taken at high noon, a picture taken from the right extreme of the horizon (actually, farther to the right on the horizon; also at near high noon), would show exactly the same kinds of rays from that vantage point. The rays that are straight down in this picture would appear slanted to the left or right from that vantage point.
3. On the moon, we would never see any rays like these, because there is no atmosphere to scatter them at all. The whole picture, above, shows rays because of the light-scattering affect of the atmosphere and the clouds.
4. The picture proves nothing about parallel or non-parallel rays from the sun.
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The sun is approximately 100 miles wider than the earth. This means that some of the rays striking the earth would travel parallel to the earth. But other rays would be traveling at all kinds of angels to the earth, within a given trigonometric function of the distances between the sun and the earth. (Note that the various parts of the earth have slightly different distances to the various parts of the sun at the same time.)
There is, also, Bernoulli's Principle to take into account, which would actually straighten the rays out, making them parallel to each other.
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You are scientifically-minded enough that you know this. So, you prove yourself deceptive, and virtually a liar who deserves any bad rating you get.