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What is ptolemy?

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Beginning with the third, chapter of the third and last book, Ptolemy turns abruptly from the quantitative measurement of musical phenomena to the speculative consideration of them, extending the principles of harmonics to sensory perception, human behavior, and, finally, to the movement of the stars and planets: what Joscelyn Godwin, in his anthology The Harmony of the Spheres: A Sourcebook of the Pythagorean Tradition in Music (Rochester, Vt. read more

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-Roman mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. read more

Ptolemy has a prominent place in the history of mathematics primarily because of the mathematical methods he applied to astronomical problems. His contributions to trigonometry are especially important. For instance, Ptolemy’s table of the lengths of chords in a circle is the earliest surviving table of a trigonometric function. read more

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