![]() ![]() The curvature becomes more readily apparent above 50,000 feet passengers on the now-grounded supersonic Concorde jet were often treated to a view of the curved horizon while flying at 60,000 feet. According to a 2008 paper in the journal Applied Optics, the Earth's curve becomes subtly visible at an altitude of around 35,000 feet, as long as the observer has at least a 60 degree field of view (which may be difficult from a passenger plane window). Most people throughout history never traveled more than a few miles from their place of birth, so the horizon that they saw was always the same. If you get lucky enough to get an unobscured view of the horizon and a high enough commercial flight, you might even be able to make out the curvature of the Earth with the naked eye. Selecting very specific data to try to prove their point or disprove the globe earth. The primary reason that ancient people believed that the Earth was flat was that it looks flat from our vantage point on the ground. ![]() Flat Earth conspiracists believe that the Earth is a flat plane rather than a spherical shape, but one conspiracy theorist accidentally debunked himself. You won't have to retrace your steps to land where you started. Netflix A resurfaced clip has shown the moment a flat Earther disproved his own beliefs during an experiment to prove the world isn't round. Anyone can circumnavigate the globe nowadays there are even travel firms, like AirTreks, that specialize in multi-stop, round-the-world routes. ![]() This one should cost you considerably less than $1 million, though you will have to drop a few thousand dollars. Ancient Greeks had advanced science and mathematics, which they used to support their claim that the Earth was round. ![]()
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