english: He noticed that every time you saw the Earth's shadow on the Moon, it was circular, and the only shape that constantly creates a circular shadow is a sphere, Q.E.D. the Earth is round.
non_english: Primetio je da svaki put kada vidimo  Zemljinu senku na Mesecu, ona je kružna, a jednini oblik  koji stalno pravi kružnu senku je sfera -  znači, Zemlja je okrugla.