Show Summary Details

Page of

Printed from Oxford Classical Dictionary. Under the terms of the licence agreement, an individual user may print out a single article for personal use (for details see Privacy Policy and Legal Notice).

date: 19 January 2021

Theodosius (4)locked

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


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.

You do not currently have access to this article


Please login to access the full content.


Access to the full content requires a subscription