This was based on a theorem that the orbital periods of the planets are longer as their orbs are farther from the centre of motion, which he found not to agree with Ptolemy's model.
Ibadəd fal təmkare tas inta alwaqatən abatol ən etran aqalan ayknan təzəjrət as ibtal nassən əkašənin fal edag ən amtəkuy, awen dǎɣ, fal inta,waroleh ad iri wan Btolémée.