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). Tech & Science We Asked Two Flat Earthers: What About the Other Planets By Meghan Bartels On 12/2/17 at 7:10 AM EST Earth, as seen on April 16, 1972, by the Apollo 16 crew. 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. 'Mad' Mike Hughes is all set to build his own rocket to see for himself that the Earth is flat. You won't have to retrace your steps to land where you started. Believers in a flat Earth argue that images showing a curved horizon are fake and that photos of a round Earth from space are part of a vast conspiracy perpetrated by NASA and other space. One believer from the Flat Earth Society is determined to find out. Eratosthenes (a Greek geographer) discovered the earth is round and not flat by carefully doing experiments, i.e., calculating the circumference of the Earth by observing differences in the sun’s angle from two different locations. Anyone can circumnavigate the globe nowadays there are even travel firms, like AirTreks, that specialize in multi-stop, round-the-world routes. Greek philosophers firstly described our Earth’s shape and argued that it is not flat. This one should cost you considerably less than $1 million, though you will have to drop a few thousand dollars.
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