KnowraPtolemaic systemLinked fromLinked fromThe 46 pages that link to Ptolemaic system, each with the reason it gives.All 46Broader topic 10Related 11Narrower topic 5Compared with 20Nicolaus CopernicusNarrower topic: It was the dominant mathematical framework that Copernicus sought to reform.EquantNarrower topic: The equant is one geometric device within this larger planetary model.Deferent and epicycleNarrower topic: The deferent and epicycle form the system’s basic machinery for modeling planets.Nasir al-Din al-TusiNarrower topic: Al-Tusi worked within this tradition while criticizing problems in its mathematical models.Tusi coupleNarrower topic: The couple addressed mathematical difficulties within a tradition built around combinations of circular motion.