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.
Brevet innehöll en upplysning som fastnade i Eratosthenes minne. Författaren påstod att klockan 12 på dagen vid sommarsolståndet, kunde han titta ner i en djup brunn och se sin spegelbild i botten av brunnen och också att huvudet blockerade solen.