claudius ptolemaeus

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Definition
  1. Proper noun:
    • Claudius Ptolemaeus, known in English as Ptolemy, was a Greco-Roman mathematician, astronomer, geographer, and astrologer who lived and worked in Alexandria, Egypt, during the 2nd century AD. He is most famous for proposing a comprehensive geocentric (Earth-centered) model of the universe, which was the dominant cosmological system in the Western and Islamic worlds for over a millennium.
Usage Examples
  • Proper noun:
    • The astronomical theories of Claudius Ptolemaeus were not seriously challenged until the time of Copernicus.
    • In his work the Almagest, Claudius Ptolemaeus compiled the knowledge of ancient Greek and Babylonian astronomy.
Advanced Usage
  • "The Ptolemaic system": This phrase refers specifically to the geocentric cosmological model developed by Claudius Ptolemaeus, which used complex systems of epicycles and deferents to explain the observed motions of the planets.
    • The Ptolemaic system was a remarkable achievement of mathematical astronomy, even though its core premise was incorrect.
Variants and Related Words
  • Ptolemy (n): The common English name for Claudius Ptolemaeus.
    • Ptolemy's map of the world was influential for centuries.
  • Ptolemaic (adj): Of or relating to Claudius Ptolemaeus or his theories.
    • The Ptolemaic model placed Earth at the center of the cosmos.
Synonyms
  • Ptolemy: The direct and most frequently used synonym in English.
Noun
  1. Alexandrian astronomer (of the 2nd century) who proposed a geocentric system of astronomy that was undisputed until the late Renaissance

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