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Theodosius of Bithynia (Greek: Θεοδόσιος; c. 169 BC – c. 100 BC) was a Greek astronomer and mathematician who wrote the Sphaerics, a book on the geometry of the sphere.

Life

Born in Tripolis, in Bithynia, Theodosius was mentioned by Strabo as among the residents of Bithynia distinguished for their learning, and one whose sons were also mathematicians. He was cited by Vitruvius as having invented a sundial suitable for any place on Earth.[1]

His chief work, the Sphaerics (Greek: σφαιρικά), provided the mathematics for spherical astronomy, and may have been based on a work by Eudoxus of Cnidus.[2] It is reasonably complete, and remained the main reference on the subject at least until the time of Pappus of Alexandria (4th century AD).[1] The work was translated into Arabic in the 10th century, and then into Latin in the early 16th century, but these versions were faulty. Francesco Maurolico translated the works later in the 16th century.[1]

In addition to the Sphaerics, two other works by Theodosius have survived: On Habitations, describing the appearances of the heavens at different climes and different times of the year, and On Days and Nights, a study of the apparent motion of the Sun. Both were published in Latin in the 16th century.[3]

Notes

References

• Ivor Bulmer-Thomas, "Theodosius of Bithynia," Dictionary of Scientific Biography 13:319–320.
• also on line "Theodosius of Bithynia." Complete Dictionary of Scientific Biography. 2008. Encyclopedia.com. 25 Mar. 2015 .
• Heath, Thomas Little (1911). "Theodosius of Tripolis" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 26 (11th ed.). Cambridge University Press. pp. 771–772.

На других языках

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[de] Theodosios von Bithynien

Theodosios von Bithynien (altgriechisch Θεοδόσιος; * zweite Hälfte 2. Jahrhundert oder 1. Jahrhundert v. Chr.)[1] war ein griechischer Mathematiker und Astronom. Er wird auch als Theodosios von Tripolis zitiert. Über Theodosios ist kaum etwas bekannt. Strabon zählt ihn zu den bedeutendsten Gelehrten Bithyniens, und auch seine Söhne waren nach Strabon bekannte Mathematiker. Da Strabon ihn in seiner Geographie in seiner Aufzählung nach Hipparchos erwähnt und er üblicherweise chronologisch vorgeht, ist Theodosios wahrscheinlich zeitlich nach Hipparch einzuordnen.

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- [en] Theodosius of Bithynia

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[es] Teodosio de Bitinia

Teodosio de Bitinia, también conocido como Teodosio de Trípoli (c. II-I a.C.)[1] fue un matemático y astrónomo de la Antigua Grecia conocido por su libro Sphearica en el que se recopilan los conocimientos hasta la época relativos a la geometría esférica, usados especialmente en astronomía.

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[fr] Théodose de Tripoli

Théodose de Tripoli (selon ver Eecke) ou Théodose de Bithynie (né vers -160 à Tripolis, dans la province de Bithynie – mort vers -90) est un astronome et mathématicien grec auteur d'un traité sur la géométrie de la sphère, les Sphériques. Vitruve lui attribue l'invention d'un cadran solaire universel (c'est-à-dire indiquant l'heure indépendamment du lieu d'utilisation).

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[it] Teodosio di Bitinia

Teodosio di Bitinia, noto anche come Teodosio Tripolita (Tripoli, 160 a.C. circa – 100 a.C.), è stato un matematico e astronomo greco antico.

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[ru] Феодосий (математик)

Феодосий (др.-греч. Θεοδόσιος, II в. до н. э.) — древнегреческий математик, часто называемый Феодосием Триполийским. Относительно его времени жизни и биографии существуют различные мнения, опирающиеся на противоречивые сообщения древних историков, ошибочно объединявших несколько лиц, носивших это имя. Он жил, по всей вероятности, во второй половине II в. до н. э., хотя его обычно называли современником Цицерона (середина I в. до н. э.).

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