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Claudius Ptolemy ( / ˈ t ɒ l ə m i / ; Greek : Κλαύδιος Πτολεμαῖος , Klaúdios Ptolemaîos , [kláwdios ptolɛmɛ́ːos] ; Latin : Claudius Ptolemaeus ; c. AD 100 – c. 170 ) was a Greco-Egyptian writer, known as a mathematician , astronomer , geographer , astrologer , and poet of a single epigram in the Greek Anthology . He lived in the city of Alexandria in the Roman province of Egypt , wrote in Koine Greek , and held Roman citizenship . Beyond that, few reliable details of his life are known. His birthplace ha
Ptolemy was the author of several scientific treatises, three of which were of continuing importance to later Byzantine , Islamic and European science. The first is the astronomical treatise now known as the Almagest , although it was originally entitled the "Mathematical Treatise" ( Μαθηματικὴ Σύνταξις , Mathēmatikē Syntaxis ) and then known as the "Great Treatise" ( Ἡ Μεγάλη Σύνταξις , Ē Megálē Syntaxis ). The second is the Geography , which is a thorough discussion of the geographic knowledge of the Grec
La dioptrique (in English Dioptrique , Optics , or Dioptrics ), is a short treatise published in 1637 included in one of the Essays written with Discourse on the Method by Rene Descartes . In this essay Descartes uses various models to understand the properties of light. This essay is known as Descartes' greatest contribution to optics, as it is the first publication of the Law of Refraction.