Qui a prouvé que la Terre est une sphère (pour la première fois) ?

Who proved that the Earth is a sphere? And who first calculated its circumference? Find out in our new mini-series: "The Origins of Ideas & Great Discoveries"! In this video, discover the two proofs provided by Aristotle to demonstrate that the Earth is a sphere, and how Eratosthenes calculated the Earth's circumference nearly 2,300 years ago!