The conversation between human and AI assistant.
Who was the first person to prove the Earth was round?
That's interesting. Could you explain a bit about the shape and size of the Earth?
Sure! The Earth is roughly spherical in shape, with a diameter of approximately 12,742 kilometers and a circumference of roughly 40,075 kilometers (at the equator). It's also slightly flattened at the poles and bulges at the equator due to its rotation on its axis.