Mathematician:Theodosius of Bithynia

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

According to, 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.

Nationality
Greek

History

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

Publications

 * 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 by, but as this information comes from the same unreliable source (mentioned above) that confuses this Theodosius with others, this is uncertain.

Critical View

 * 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 justified in replying that must have believed he had found a kindred spirit.