Geocentric model: Quick Facts

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Facts

Also Known As	geocentric system

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Geocentric system

Tycho Brahe's model of Saturn's motion

How did Ptolemy explain retrograde motion?

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Topics

Ptolemaic system Heliocentrism Tychonic system Solar system Copernican system Comet Sun Kuiper belt Asteroid Meteorite Meteor and meteoroidmeteoroid Space weather Small body Planet

Key People

Engraving of six astronomers, with Hipparchus seated at center and, from left to right, Galileo, Johannes Hevelius, Tycho Brahe, Nicolaus Copernicus, and Ptolemy standing, each holding scientific instruments.

Hipparchus

Greek astronomer

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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