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It was mistakenly believed that more levels of epicycles (circles within circles) were added to the models to match more accurately the observed planetary motions.
en.wikipedia.org A planet or the center of an epicycle (a smaller circle carrying the planet) was conceived to move with a uniform angular speed with respect to the equant.
en.wikipedia.org Although it was capable of accurately predicting the planets' position in the sky, more and more epicycles were required over time, and the model became more and more unwieldy.
en.wikipedia.org He naturally regarded circular motion as fundamental and then used the circular motion of deferents and epicycles in his earth-centered theory.
en.wikipedia.org In other words, to a hypothetical observer placed at the equant point, the center of the epicycle would appear to move at a steady angular speed.
en.wikipedia.org