Callippus made the position of the spheres the same as Eudoxus did, but while he assigned the same number as Eudoxus did to Jupiter and to Saturn, he thought two more spheres should be added to the sun and two to the moon, if one is to explain the observed facts;
Eta hirugarren esferaren poloak berberak dira Afroditaren eta Hermesen kasuan, baina gainerako planetek berezko poloak dituzte.