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Ptolemaic System

Definition: The Ptolemaic system is a geocentric cosmological model proposed by Claudius Ptolemy. It was widely accepted in the ancient world and medieval Europe and proposed that the Earth was the center of the universe, with all celestial objects, including the sun, moon, planets, and stars, orbiting around it in circular paths.

Examples:

1. In the Ptolemaic system, the Earth was considered motionless at the center of the universe.
2. Nicolaus Copernicus challenged the Ptolemaic system by proposing a heliocentric model with the sun at the center.

Related Products:

• Books on the Ptolemaic system
• Geocentric cosmology
• Astronomy history