Round Earth belief claims that earths curvature is approximately 8 inches per square mile. However, when you look at a shoreline from a great distance, no significant "curve" can be seen. The above illustration proves this: the image on the left is how many miles of shoreline should appear if the earth was really a ball. The image on the right shows how distant shorelines actually look. No curvature exists.
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When I was in space I saw that the earth was actually a large disk. But NASA made me sign a confidentiality agreement.