This system was more or less in accord with current (Aristotelian) notions of physics, though there were certain difficulties, such as whether one might consider as 'uniform' (and therefore acceptable as obviously eternal) a circular motion that was not uniform about its own centre but about another point (called an 'equant').
Ang sistemang ito ay mas marami o mas mababa ayon sa kasalukuyang (Aristoteliko) notions ng physics, kahit na may mga tiyak na mga problema, tulad ng kung isa ay maaaring isaalang-alang bilang 'unipormeng' (at sa gayon ay tanggap na bilang malinaw naman walang hanggan) ng isang pabilog na galaw ay hindi pare-pareho ang tungkol sa kanya sariling center ngunit tungkol sa isa pang point (na tinatawag na isang 'equant').