Inner circles, in astronomy models

Usage examples of epicycles.

For one thing, their astronomers have created an elaborate system of epicycles to account for the movements of the planets.

She faltered, remembering how quickly others got bored when she got caught up in cycles and epicycles, conjunctions and precession, the endlessly intriguing wonder of the universe.

But when it came to almagest and astrolabe, the counting of figures and reckoning of epicycles, away would go her thoughts to horse and hound, and a vacant eye and listless face would warn the teacher that he had lost his hold upon his scholar.