Übersetzen...
Automatische Übersetzung:
Circumference of the Earth. Eratosthenes (250 BC) calculated the circumference of the Earth by measuring noontime shadows at two localities of different latitude. Leonardo da Vinci (1452-1519) developed a novel way to measure the area of a circle using the rotation of wheel half the thickness of its radius. The Science and Technology Museum Leonardo da Vinci. Milan. Italy.