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from | Encarta |  |
Ptolemaic System |
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| In the 2nd century ad, Claudius Ptolemy proposed a model of the universe with the earth at the center. The model depicts the earth as stationary with the planets, moon, and sun moving around it in small, circular orbits called epicycles. Ptolemy appears to have been more concerned with finding a model that worked mathematically than one that described planetary motion accurately. Although it was later shown to be incorrect, Ptolemy’s model was accepted for several centuries. | ||||||
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| Mary Evans Picture Library/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Mathematics; Science; Ptolemy; Ptolemaic System | ||||||
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