The deferent-uye-epicycle womuenzaniso rakanga raishandiswa nevaGiriki vazivi venyeredzi kwemazana emakore pamwe pfungwa eccentric (a deferent riri zvishoma kure-pakati kubva Earth), iyo yakanga yakatokura. Mumufananidzo, pakati deferent haisi Earth asi gwapa akacherechedza X, zvichiita eccentric (kubva Greek ἐκ ec- zvichireva "kubva", uye κέντρον kentron zvichireva "pakati"), iyo gwapa anotora zita rayo kubva. Zvinosuruvarisa, hurongwa kuti aiwanika Ptolemy nguva haana chaizvo anoenderana nokucherechedza, kunyange zvazvo zvakanga zvikuru nani pamusoro Hipparchus'system. Most notably kukura retrograde yepasi (kunyanya kuti Mars) aizova yakakura kupfuura zvaitarisirwa madhigirii, dzimwe nguva zvichiguma 30 madhigirii ose equivential kukanganisa.
Vazivi venyeredzi vechiGiriki