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O sábio passou boa parte da vida em Alexandria. Em 255 a.C., criou a esfera armilar; calculou com bastante precisão para a época a distância da Terra ao Sol. Em 236 a.C., foi escolhido como director da famosa Biblioteca de Alexandria. Acredita-se que Eratóstenes tenha ficado cego em 194 a.C. e, um ano depois, tenha morrido por inanição, propositadamente deixando de se alimentar.

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