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Geocentric model - Wikipedia
Celestial spheres - Wikipedia
Geocentric model: The Earth-centered view of the universe
What Is The Geocentric Model Of The Universe?
Ptolemaic system | Definition & Facts | Britannica
Geocentric model | Definition, History, & Facts | Britannica
Lecture 13: The Harmony of the Spheres: Greek Astronomy
Geocentric Cosmology. - Explaining Science
A161, Lecture 4 - Ohio State University
Astronomy and Cosmology: Geocentric and Heliocentric Models …
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