![]() 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. 21 total solar eclipse that crossed the contiguous United States as 'evidence' of their beliefs. 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). Then, they're proof, duh, that the Earth is flat. 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. How do we go about proving that MICHELLE THALLER: Thats a hard thing for me to. Anyone can circumnavigate the globe nowadays there are even travel firms, like AirTreks, that specialize in multi-stop, round-the-world routes. BILL NYE: Is the earth flat or round Its round, okay. This one should cost you considerably less than $1 million, though you will have to drop a few thousand dollars.
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