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Strabo, Geography (ed. H.C. Hamilton, Esq., W. Falconer, M.A.), BOOK I., CHAPTER I. (search)
Greek and Roman Biography and Mythology.
"Eratosthenes of Cyrene was, according to Suidas, the son of Aglaus,
according to others, the son of Ambrosius, and was born B. C. 276. He
was taught by Ariston of Chius, the philosopher, Lysanias of Cyrene, the
grammarian, and Callimachus, the poet. He left Athens at the invitation
of Ptolemy Euergetes, who placed him over the library at Alexandria.
Here he continued till the reign of Ptolemy Epiphanes. He died at the
age of eighty, about B. C. 196, of voluntary starvation, having lost his
sight, and being tired of life. He was a man of very extensive learning:
we shall first speak of him as a geometer and astronomer.
"It is supposed that Eratosthenes suggested to Ptolemy Euergetes the
construction of the large armillœ, or fixed circular instruments, which
were long in use at Alexandria; but only because it is difficult to imagine
to whom else they are to be assigned, for Ptolemy the astronomer, though
he mentions them, and incide