Mathematician:Theodosius of Bithynia

Greek astronomer and mathematician best known for writing Sphaerics, a book on spherical geometry.

According to Vitruvius, he is supposed to have invented a sundial which would work anywhere in the world.

Sometimes confused with various other writers called Theodosius. On this basis, often erroneously believed to have been born in Tripolis.

According to :
 * "It is evident that Theodosius was simply a laborious compiler, and that there was practically nothing original in his work."

To which one might feel one was justified in replying that Heath must have believed he had found a kindred spirit.

Nationality
Greek

History

 * Born: c. 160 BCE, Bithynia, Anatolia (now Turkey)
 * Died: c. 100 BCE

Books and Papers

 * Sphaerics (possibly inspired or influenced by a lost work by )
 * On Habitations (discussing astronomical matters from the point of view of various different latitudes)
 * On Days and Nights (on the apparent motion of the Sun)

Possibly also wrote a commentary on The Method by, but as this information comes from the same unreliable source (mentioned above) that confuses this Theodosius with others, this is uncertain.