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.
둥글다고 알려주었죠. 그리고 언제나 둥근 그림자를 만드는 형체는 구체라고 증명했습니다. 완벽하죠, 지구는 둥급니다.