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Ptolemy’s Geography |
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| This illustration of Ptolemy, an astronomer and mathematician of the 2nd century ad, appears in the 1482 Ulm edition of his Geography, which charted the world as it was known during his time. In the illustration Ptolemy holds an armillary sphere, an ancient astronomical instrument made of brass rings. | ||||||
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| Gianni Dagli Orti/Corbis | ||||||
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| Appears in these articles: | ||||||
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| Ptolemy; Geography | ||||||
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