You strain your eyes, then take out your favorite binoculars and stare through them, as far as your eyes (with the help of the binocular lenses) can see. Standing on a flat plateau, you look ahead toward the horizon. To see this demonstrated, refer to my experiment video about Eratosthenes and the circumference of the Earth. This, again, is because the Earth is round, and not flat.Įratosthenes (276-194 BCE) used this principle to calculate the circumference of the Earth quite accurately. If the world had been flat, then two sticks in different locations would produce the same shadow.īut they don’t. The shadow moves as time passes (which is the principle for ancient Shadow Clocks). If you stick a stick in the (sticky) ground, it will produce a shadow. This would not have happened if the world was flat: 4. The farther you go from the equator, the farther the “known” constellations go towards the horizon, to be replaced by different stars. This observation was originally made by Aristotle (384-322 BCE), who declared the Earth was round judging from the different constellations one sees while moving away from the equator.Īfter returning from a trip to Egypt, Aristotle noted, “There are stars seen in Egypt and … Cyprus which are not seen in the northerly regions.” This phenomenon can only be explained if humans were viewing the stars from a round surface, Aristotle continued, claiming that the sphere of the Earth is “of no great size, for otherwise the effect of so slight a change of place would not be quickly apparent.” If you would do that experiment with the ant approaching along a long road rather than a round object, the effect would change: The ant would slowly “materialize” into view (depending on how sharp your vision is). If you look at the orange “head on”, you will see the ant’s body slowly rising up from the “horizon” because of the curvature of the orange. Imagine an ant walking along the surface of an orange, into your field of view. The reason ships appear as if they “emerge from the waves” is because the world is not flat: It’s round. ![]() If you’ve been next to a port lately, or just strolled down a beach and stared off vacantly into the horizon, you might have noticed a very interesting phenomenon: Approaching ships do not just “appear” out of the horizon like they should have if the world was flat, but rather seem to emerge from beneath the sea.īut, you say, ships do not submerge and rise up again as they approach our view (except in Pirates of the Caribbean, but we are hereby assuming that was a fictitious movie series). Since the earth is rotating (see the “ Foucault Pendulum” experiment for a definite proof, if you are doubtful), the consistent oval-shadow it produces in each and every lunar eclipse proves that the earth is not only round but spherical-absolutely, utterly, beyond a shadow of a doubt not flat. This shadow is the planet’s, and it’s a great piece of round-Earth evidence. It was quite a mystery to the ancient Greeks, though, and in their quest for knowledge, they came up with a few insightful observations that helped humanity figure out the shape of our planet.Īristotle (who made quite a lot of observations about the spherical nature of the Earth) noticed that during lunar eclipses (when the Earth’s orbit places it directly between the sun and the moon, creating a shadow in the process), the silhouette on the satellite’s surface is round. Now that humanity knows quite positively that the moon is not a piece of cheese or a playful god, the phenomena that accompany it (from its monthly cycles to lunar eclipses) are well-explained. On we go, to the top 10 ways to unequivocally, absolutely, positively prove the Earth isn’t flat. You don’t need to denounce all science and knowledge and believe in a conspiracy theory to enjoy some historical factoids about humanity’s quest for space. ![]() But the history of our species’ intellectual pursuit is important and interesting. He claims it’s ridiculous to even bother rebutting the Flat Earth Society-and I tend to agree. I’ve had a few ideas on how to do that, but got an interesting incentive when Phil Plait, The Bad Astronomer, wrote about the the Flat Earth Society. Humanity has known the world is not flat for a few millennia, and I’ve been meaning to show more methods on how to prove the Earth is round. This article was originally posted on her Smarter Than That blog in 2008 and has been lightly edited for Popular Science. Moriel Schottlender is a software engineer at Wikimedia Foundation.
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