Lady Antebellum - Golden

Eratosten (Eratostenns) [approx. 276 BC, Cyrene, Sev. Africa - 194 BC e., Alexandria] - other Greek. scientist (geographer, mathematician, philosopher), poet and musician. He studied in Alexandria with Kallimachus (also with Lysanius of Cyrenes), then in Athens with Zeno. Egypt was invited. King Ptolemy III to Alexandria to lead the famous Alexandria b-koi. Specialist.E.'s works on music are unknown, but it is given to it means. a place in a number of his works (for example, in the Platonic treatise, he examines from the position of Plato's philosophy the basic mathematical concepts, in particular the “principles of music”). E. Merits as a music. theorist - in the development of the doctrine of scale scales, intervals, consonance and dissonance. The most important of his achievements is considered (which came to us through Claudius Ptolemy) to calculate the interval of natural minor third as a ratio of 6: 5 (and, accordingly, the remaining part of the chromatic tetrachord - as a small whole tone 10: 9). E. also established his system of divisions of the tetrachord (by birth and color).