Ptolemaic system

noun

Definition of Ptolemaic system

: the system of planetary motions according to which the earth is at the center with the sun, moon, and planets revolving around it and each orbit except for the sun and moon is composed of a principal circle upon which moves a smaller circle carrying the planet — compare copernican system, deferent, eccentric entry 2 sense 2, epicycle

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History and Etymology for Ptolemaic system

after Ptolemy fl 2d century a.d. who maintained it

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Ptolemaic

Ptolemaic system

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Cite this Entry

“Ptolemaic system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Ptolemaic%20system. Accessed 30 Jun. 2022.

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