| 11. | Ptolemy moved the observation point explicitly off the center of the deferent to the equant.
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| 12. | That seems to contradict Deferent and epicycle.
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| 13. | Astronomers responded by introducing the deferent and epicycle, which caused a planet to vary its distance.
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| 14. | This article describes absolutely deferent company than the one previously deleted for the lack of notable references.
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| 15. | Ptolemy did not predict the relative sizes of the planetary deferents in the " Almagest ".
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| 16. | Newtonian or classical mechanics eliminated the need for deferent / epicycle methods altogether and produced more accurate theories.
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| 17. | Only after Kepler's refinement of Copernicus'theory was the need for deferents and epicycles abolished.
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| 18. | The " Syntaxis " adopted Hipparchus'solar model, which consisted of a simple eccentric deferent.
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| 19. | All of his calculations were done with respect to a normalized deferent, considering a single case at a time.
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| 20. | It was the use of equants to decouple uniform motion from the center of the circular deferents that distinguished the Ptolemaic system.
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