PLATO

Aside from developing the system of concentric spheres upon which the epicyclic Ptolemaic arrangement of the solar system was based, what other remarkable achievement was made by this great follower of Plato?

A.He first suggested that the solar system was sun-centered B.He read all of Aristotle’s work straight through without falling asleep C.He estimated the diameter and the circumference of the Earth accurately to within 1 mile D.He estimated the solar year to be 365 days and six hours long