epicycles, and uniform speeds, while at the same time using accurate ideas such as:

* The Earth is one of several planets revolving around a stationary sun in a determined order.
* The Earth rotates daily on its axis and revolves annually about the Sun.
* Retrograde motion of the planets is explained by the Earth's motion.
* The distance from the Earth to the Sun is small compared to the distance from the Sun to the stars.

The Copernican model was later replaced by

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