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[–] 20477162? ago
You can calculate the shape of the earth using the curve on a cup of tea, if you have sensitive enough measurement equipment that is.
For the rest of us, a zoom lens and a flat body of water at least 5-10 kms long should do the trick.
There are even videos of these experiments online, using the great lakes; if you don't want to bother with the 5 minutes of math and a half day long experiment all on your own.