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There are people claiming that the earth is flat. Most notably the flat earth society. While I believe this is mostly run by people with good knowledge of science having a fun side-project, I'm having a hard time disproving them.

How do you really prove that the earth is round?

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    Without reading over their wiki and just assuming a simple concept. The first thing that comes to mind is see if your GPS works. You would have to assume they are lying about the way it works. And if they are, how does it work? A couple other ideas is to check airline flight paths and distances. A compass would be difficult to explain under a flat earth. The sun being at a different angle in north and south latitudes and seasons also. Weights are lighter at the equator. Even the makeup of the atmosphere. Atomic clocks at different latitudes. (ignoring astronauts of course) – Adam Phelps Jul 3 '15 at 2:30
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    You might have to narrow it down to a specific model. Some flat-earth models are quite hard to disprove because they make exactly the same predictions as the standard model of the universe, just in an unnecessarily awkward way. – Philipp Jul 3 '15 at 8:26
  • The linked site seems to be a humorous site. – Sklivvz Jul 3 '15 at 10:18
  • Note the round shadow of the earth cast on the moon's surface during a lunar eclipse... – user17430 Jul 7 '15 at 16:56
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    @Skliwz How exactly is this off topic? While most people know the earth is round, there's a good large chunk of people who are challenging this claim today, and many of them are indeed very serious. Hell, I even got fooled for a second because of lack of evidence for the earth being round; or much of said evidence actually still applying were the earth flat. The strongest argument I've found for a rounded earth is indeed however the Coriolis Effect; Satellites and other planets viewed through a telescope. – Cestarian Mar 9 '16 at 21:29

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