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Ancient Greek Gravity
- Ancient Greeks lacked our concept of gravity as a force.
- They believed objects' movements stemmed from elemental compositions, with fire rising and earth sinking.
Ptolemaic Model
- The Ptolemaic model, based on Aristotle's geocentric view, used epicycles to explain planetary motion.
- This complex system remained dominant until the 16th century.
Copernican Model
- Copernicus proposed a heliocentric model, simplifying retrograde motion.
- However, discrepancies remained, requiring epicycles.