By doing so, we will see that the exact circumference of the Earth is 40 075 km. There are some, however—the Flat Earth Society to be precise—who argue that the Earth is in fact not a sphere, but a flat plane.

However, more than 2000 years ago, ancient scholars managed to find out the Earth is a sphere—though an irregularly shaped one.

So, how on Earth did the ancient know the Earth was round, thousands of years ago, and without modern equipment?
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