Theodosius of Bithynia
Ancient Greek astronomer / From Wikipedia, the free encyclopedia
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Theodosius of Bithynia (Greek: Θεοδόσιος Theodosios; 2nd–1st century BC) was a Hellenistic astronomer and mathematician from Bithynia who wrote the Spherics, a treatise about spherical geometry, as well as several other books on mathematics and astronomy, of which two survive, On Habitations and On Days and Nights.