The letter included this fact that stuck in Eratosthenes' mind, and the fact was that the writer said, at noon on the solstice, when he looked down this deep well, he could see his reflection at the bottom, and he could also see that his head was blocking the sun.
A carta referia um facto que ficou  na cabeça de Eratóstenes. O escritor disse que, ao meio-dia, no solstício, quando olhava para  o fundo de um poço, ele conseguia ver o seu reflexo no fundo,  assim como a sua cabeça a bloquear o sol.