Apollonius was also an important founder of Greek mathematical astronomy, which used geometrical models to explain planetary theory. Ptolemy in his book Syntaxis says Apollonius introduced systems of eccentric and epicyclic motion to explain the apparent motion of the planets across the sky.
Apollonius rin ay isang mahalagang tagapagtatag ng Greek matematiko astronomy, na kung saan ginagamit heometriko modelo na ipaliwanag pamplaneta theory. Ptolemy sa kanyang mga libro Syntaxis sabi ni Apollonius nagpasimula ng mga sistema ng sira-sira at epicyclic galaw na ipaliwanag ang maliwanag na kilos ng mga planets sa langit.