Ptolemy [Klaudios Ptolemaios; Claudius Ptolemaeus]
- Lukas Richter
(b ?Ptolemais, after 83 ce; d 161 ce). Greek mathematician, geographer, astronomer and music theorist. He probably had access to an observatory at Alexandria, where he spent his working life. His major work, on mathematics and astronomy, was the Almagest (Arabic, al-majistī; Ptolemy's original title was ...