Why does the earth appear flat to us?
Answers
If you scale down the planet Earth to the size of a regulation basketball, a human on that basketball would be 0.50 microns in length, the size of a small bacteria. You could have a large city of bacteria sized people on part of one of the basketball’s dimples. Those humans would argue that its obvious that the earth is a countious array of mighty rounded mountains. Its mountainous terrain forever as far as the eye can see. It’s the same with us. We are like bacteria on a basketball. To the bacteria the basketball is rolling mountains that go on forever. The visual line of sight limits would be the couple of adjacent dimples.
Human are way too small compared with the earth to visually experience the roundness unless at a height approaching the upper limits of the atmosphere to get any initial hints of curvature.
