5 Questions
According to ancient and medieval thinkers, what were the celestial orbs made of?
Thick spheres of rarefied matter
What did scholars presume about each planetary sphere when applying Ptolemy's epicycles?
Each planetary sphere was in complete contact with the sphere above and below it
What was the purpose of the celestial orbs in the cosmological models?
To account for the apparent motions of the fixed stars and planets
What did ancient and medieval thinkers believe about the positions of the fixed stars relative to one another?
They believed the fixed stars were on the surface of a single starry sphere
How are the orbits of the planets viewed in modern thought?
As paths through mostly empty space
Test your knowledge on the celestial spheres and their role in ancient cosmological models. Explore the theories of Plato, Aristotle, Copernicus, and more as you answer questions about the celestial orbs and their connection to the motions of stars and planets.
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