Greek astronomer Ptolemy created a complex geocentric model. Each planet spun in a ______ while orbiting Earth. This model explained why planets appear to move backward. This model... Greek astronomer Ptolemy created a complex geocentric model. Each planet spun in a ______ while orbiting Earth. This model explained why planets appear to move backward. This model persisted for centuries due to ______, religion, and philosophy.
Understand the Problem
The question is asking for specific terms related to the Ptolemaic model of the universe, such as what type of motion the planets used and the reasons for the model's longevity.
Answer
epicycle; tradition
The final answer is: Each planet spun in an epicycle while orbiting Earth. This model persisted for centuries due to tradition, religion, and philosophy.
Answer for screen readers
The final answer is: Each planet spun in an epicycle while orbiting Earth. This model persisted for centuries due to tradition, religion, and philosophy.
More Information
The Ptolemaic model used epicycles to explain the apparent retrograde motion of planets. It was widely accepted due to its alignment with prevailing philosophical and religious beliefs.
Tips
A common mistake is confusing epicycles with deferents. Epicycles are the smaller circles around which planets move, while deferents are the larger circles around which epicycles revolve.
Sources
- Ptolemaic system | Definition & Facts - Britannica - britannica.com
