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geocentric model
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geocentric system Tycho Brahe's model of Saturn's motion
How did Ptolemy explain retrograde motion?
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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How did Ptolemy explain retrograde motion?
Ptolemy's theory of the solar system.
Video: Encyclopædia Britannica, Inc.

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geocentric system
Ptolemaic diagram of a geocentric system, from the star atlas Harmonia Macrocosmica...
Photos.com/Thinkstock
Tycho Brahe's model of Saturn's motion
Engraving of Tycho Brahe's model of the motion of the planet Saturn, from his Astronomiae...
The Adler Planetarium and Astronomy Museum, Chicago
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