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How to Convince Your Flat-Earth Friends the World Is Round
Two experiments you can do yourself to finally, definitively put this question to rest.
This photo was taken on the north shore of Lake Pontchartrain looking toward the buildings of New Orleans on the south side. We'll call that distance s. If the Earth is indeed curved, we can use previous experimental results to say that it has a radius ( R) of 6.38 million meters. Imagine you have a mass hanging from a point exactly at the North Pole (assuming there is still some ice there for you to stand on).
Or read this on Wired