Encyclopedia Astronautica
Ptolemy


Ptolemy, Claudius (fl 127) Greek philosopher, theorized that the universe had the Earth at its center with the planets, Moon, Sun, and stars orbiting around it. This concept was dogma for 1500 years until Copernicus placed the sun at the center. Also catalogued 1,022 star

Claudius Ptolemy of Alexandria, Egypt, was responsible for the development of the "Ptolemaic System" of understanding the universe. It placed the Earth at its center with the planets, Moon, Sun, and stars orbiting overhead. Ptolemy based his system on observations of celestial bodies and the application of mathematical models that adequately explained the movements he observed. He also catalogued 1,022 stars.

Born: fl.127.
Died: 0145.01.01.

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Bibliography
  • Launius, Roger D, NASA Chief Historian, NASA History Office Home Page, Web Address when accessed: here.

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