| 11. | Ancient Greek, ancient Roman and medieval philosophers usually combined the geocentric model with a spherical Earth.
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| 12. | While maintaining the physical reality of the geocentric model, he criticized elements of the Ptolemic models.
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| 13. | In these geocentric models the stars and planets are carried around the Earth on spheres or circles.
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| 14. | This is known as the geocentric model of the Universe, or the Ptolemaic system, named after Ptolemy.
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| 15. | The nine spheres are concentric, as in the standard medieval geocentric model of cosmology, which was derived from Ptolemy.
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| 16. | The Tusi couple was later employed in Ibn al-Shatir's geocentric model and Nicolaus Copernicus'Copernican model.
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| 17. | It's possible to construct a geocentric model of the universe, and it worked for hundreds and hundreds of years.
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| 18. | Childrey, though in other ways a convinced Baconian, argued that Bacon's geocentric model of the cosmos was incorrect.
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| 19. | The geocentric model served as the predominant description of the cosmos in many ancient civilizations, such as those of Aristotle and Ptolemy.
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| 20. | In the 4th century BC, two influential Greek philosophers, Plato and his student Aristotle, wrote works based on the geocentric model.
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