Mathematician:Claudius Ptolemy

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Roman citizen, of either Greek or Egyptian ancestry.

Mathematician, astronomer and general all-round scientist.

Best known for being the author of several scientific works, including Almagest.


Roman (of Greek or Egyptian origin).


  • Born: c 90 CE, Ptolemais Hermiou in the Thebaid
  • Died: c 168 CE, Alexandria in Egypt


Results named for Claudius Ptolemy can be found here.

Definitions of concepts named for Claudius Ptolemy can be found here.


  • c. 150: Mathematical Syntaxis, otherwise known as Almagest ("The Greatest") (on astronomy)
  • c. 150: Apotelesmatika ("Astrological Outcomes" or "Effects") or (in Latin) Tetrabiblos ("Four books") (on astrology)
  • Planetary Hypotheses (on astronomy)
  • Handy Tables (on astronomy)
  • Phaseis (Risings of the Fixed Stars)
  • Geographia
  • Harmonics (on music theory)
  • Optics

Also known as

Latin name: Claudius Ptolemaeus, in Greek: Κλαύδιος Πτολεμαῖος (Klaúdios Ptolemaîos).

Known generally as Ptolemy (pronounced Toll-em-ee).