![]() 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). 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. You won't have to retrace your steps to land where you started. Consider one, standard, flat earth line: Can you prove the world is round Maybe you point to the (often artificially assembled) photos of Earth from space. Anyone can circumnavigate the globe nowadays there are even travel firms, like AirTreks, that specialize in multi-stop, round-the-world routes. The conspiracy theorist Bob Knodel hosts a YouTube channel that is specifically dedicated to the false theory that the Earth is flat. ![]() Yet Knodel's beliefs seem unchanged when discussing the experiment at a Flat. ![]() This one should cost you considerably less than $1 million, though you will have to drop a few thousand dollars. A Flat Earther has gone viral for accidentally proving that the Earth is round after spending 20,000 on an experiment to show otherwise. Despite further experimental refinements, Knodel's gyroscope consistently behaves as if the Earth is round. ![]()
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