![]() I don’t expect this to change the minds of any entrenched flat earth believers, but I hope that this interesting experiment could help someone that may be susceptible to persuasion by the flat earthers’ arguments.” Using the appearance of the horizon as primary evidence, this creature would likely assume that they are living on a flat surface. “From the perspective of that tiny creature, the “horizon” of the basketball would always look “flat”. “Looking at my photos, it’s easy to imagine being an incredibly small creature living on the surface of the basketball,” Jeff told Bored Panda. He used a basketball and a macro lens to simulate the curvature of the Earth and took photos to calculate the equivalent. 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.However, a 36-year-old software engineer called Jeff went for something much simpler. 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. 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.
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