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the ptolemaic system is the earth is at the center of the universe with the sun, moon, planets and stars revolving about it in circular orbits.

However, Tycho measure no parallax for the stars, so he concluded that Earth had to be stationary.

and then,he rejects the Ptolemaic model because of its inaccuracy. He preserved the central immobile Earth.

so in Tycho's model, the sun and moon revoling around Earth, but the planets around the sun. all motion was along circular paths.

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