# Did Archimedes know about Callipus?

Various sources, such as Cicero's Republic state that Archimedes had made a machine consisting of glass spheres that represented the Eudoxian system of the world.

Considering that Callipus died over a decade before Archimedes was born, would Archimedes have been aware of Callipus' work and therefore would his mechanism use the full 34 spheres needed to account for planetary movement as Callipus suggested instead of the 27 used by Eudoxus?

• I am not convinced that Callipus' system was any improvement on that of Eudoxus. – fdb Aug 25 '15 at 23:35