As a consequence, the apparent gravitational acceleration is the same everywhere on earth. They mostly agree though that gravity does not exist, and that the observations we normally attribute to gravity come instead from the upward acceleration of the flat earth.
And a minority of flat earthers believe that earth is really an infinite plane. An alternative is the so-called bipolar model where both poles are on the disk, surrounded by water that’s held by a rim of something, maybe ice or rocks. But not all flat earthers sign up to this. The most popular flat earth model is that of a disk where the North pole is in the middle and the south pole is an ice wall on the edge of the disk. More importantly, I also want to explain why you should not be embarrassed if you can’t remember how we know that the earth is round.īut first I have to tell you what flat earthers actually believe and how they got there. Today, I want to tell you why I nevertheless think flat earthers are neither stupid nor anti-scientific. Here you have a group of people steadfastly rejecting evidence that’s right in their face. 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.I, as many people in science communication, am fascinated with flat earthers. 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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