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date: 19 January 2021

Theodosius (4)locked

, of Bithynia, astronomer and mathematician
  • G. J. Toomer

Extract

Theodosius (4) of Bithynia, astronomer and mathematician (fl. c.100 bce), wrote three treatises on elementary ‘spherics’: Σφαιρικά, in three books, dealing with great and small circles on the sphere; Περὶ οἰκήσεων (‘On Habitations’), on the variations in celestial phenomena at different terrestrial latitudes; and Περὶ ἡμερῶν καὶ νυκτῶν (‘On Days and Nights’), in two books, on the variations in the length of day and night resulting from the sun's travel through the zodiac.

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