Is the earth flat?


Staff member
I have a friend who swears it is. Many arguments have ensued. I said to him, "If the earth is flat, when the sun is shining, why doesn't it light up the whole of the flat earth?" His answer was it is more like a torch, so you don't see it from the other areas. Ahem.


Founding Member
The ancient Greeks even knew the Earth was round by looking at the shape of the Earth's shadow during partial lunar eclipses. Eratosthenes computed the diameter from simple geometry and got within 10% of being right. But he did it 2300 years ago and he did the computation without using any kind of mechanical or electronic calculator!