Theodosius of Bithynia

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Theodosius of Bithynia (ca. 160 BC – ca. 100 BC) was a Greek astronomer and mathematician who wrote the Sphaerics, a book on the geometry of the sphere. Born in Tripolis, in Bithynia, Theodosius is cited by Vitruvius as having invented a sundial suitable for any place on Earth. His Sphaerics provided the mathematics for spherical astronomy, and may have been based on a work by Eudoxus of Cnidus. Francesco Maurolico translated his works in the 16th century. In addition to the Sphaerics, two other works by Theodosius have survived: On Habitations, describing the appearances of the heavens at different climes, and On Days and Nights, a study of the apparent motion of the Sun.

References [edit]

• Ivor Bulmer-Thomas, "Theodosius of Bithynia," Dictionary of Scientific Biography 13:319-320.

v t e Greek astronomy Astronomers Acoreus Aglaonike Agrippa Anaximander Andronicus Apollonius Aratus Aristarchus Aristillus Attalus Autolycus Bion Callippus Cleomedes Cleostratus Conon Eratosthenes Euctemon Eudoxus Geminus Heraclides Hicetas Hipparchus Hippocrates of Chios Hypsicles Menelaus Meton Oenopides Philip of Opus Philolaus Posidonius Ptolemy Pytheas Seleucus Sosigenes of Alexandria Sosigenes the Peripatetic Strabo Thales Theodosius Theon of Alexandria Theon of Smyrna Timocharis Works Almagest (Ptolemy) On Sizes and Distances (Hipparchus) On the Sizes and Distances (Aristarchus) On the Heavens (Aristotle) Instruments Antikythera mechanism Armillary sphere Astrolabe Dioptra Equatorial ring Gnomon Mural instrument Triquetrum Concepts Callippic cycle Celestial spheres Circle of latitude Counter-Earth Deferent and epicycle Equant Geocentrism Heliocentrism Hipparchic cycle Metonic cycle Octaeteris Solstice Spherical Earth Sublunary sphere Zodiac Influences Babylonian astronomy Egyptian astronomy Influenced European astronomy Indian astronomy Islamic astronomy

v t e Greek mathematics Mathematicians Anaxagoras Anthemius Archytas Aristaeus the Elder Aristarchus Apollonius Archimedes Autolycus Bion Boethius Bryson Callippus Carpus Chrysippus Cleomedes Conon Ctesibius Democritus Dicaearchus Diocles Diophantus Dinostratus Dionysodorus Domninus Eratosthenes Eudemus Euclid Eudoxus Eutocius Geminus Heron Hipparchus Hippasus Hippias Hippocrates Hypatia Hypsicles Isidore of Miletus Leo the Mathematician Marinus Menaechmus Menelaus Metrodorus Nicomachus Nicomedes Nicoteles Oenopides Pappus Perseus Philolaus Philon Porphyry Posidonius Proclus Ptolemy Pythagoras Serenus Simplicius Sosigenes Sporus Thales Theaetetus Theano Theodorus Theodosius Theon of Alexandria Theon of Smyrna Thymaridas Xenocrates Zeno of Elea Zeno of Sidon Zenodorus Treatises Almagest Archimedes Palimpsest Arithmetica Conics Elements On the Sizes and Distances (Aristarchus) On Sizes and Distances (Hipparchus) On the Moving Sphere The Sand Reckoner Centers Cyrene Library of Alexandria Platonic Academy Influences Babylonian mathematics Egyptian mathematics Influenced European mathematics Indian mathematics Mathematics in medieval Islam Tables Timetable of Greek mathematicians Problems Problem of Apollonius Squaring the circle Doubling the cube Angle trisection

Persondata
Name	Theodosius
Alternative names
Short description	Greek astronomer
Date of birth	160 BC
Place of birth
Date of death
Place of death

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