Geocentric model

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Figure of the heavenly bodies — An illustration of the Ptolemaic geocentric system by Portuguese cosmographer and cartographer Bartolomeu Velho, 1568 (Bibliothèque Nationale, Paris)

In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system), is the theory that the Earth is the orbital center for all celestial bodies. This model served as the predominant cosmological system in many ancient civilizations such as ancient Greece. As such, most Ancient Greek philosophers assumed that the Sun, Moon, stars, and naked eye planets circled the Earth, including the noteworthy systems of Aristotle (see Aristotelian physics) and Ptolemy.

• See also: Wikipedia

• Related: Celestial spheres, Firmament, Religious cosmology, Flat Earth

Another demonstration of the complexity of observe... Another demonstration of the complexity of observed orbits when assuming a geocentric model of the solar system www.astro.utoronto.ca/~zhu/ast210/geocentric.html - Web

Geocentric Perspective animation of the Solar Syst... Geocentric Perspective animation of the Solar System in 150AD www.astronomy.ohio-state.edu/~pogge/Ast161/Movies/#ptolemaic - Web

Ptolemy’s system of astronomy Ptolemy’s system of astronomy library.thinkquest.org/29033/history/ptolemy.htm - Web

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The Galileo Project – Ptolemaic System The Galileo Project – Ptolemaic System galileo.rice.edu/sci/theories/ptolemaic_system.html - Web

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