Event Summary:
For nearly 2,000 years, Aristotle’s ideas governed Western views of nature, motion, and the cosmos. His authority shaped medieval universities, Christian theology, and Islamic science. Though logical and comprehensive, his models—especially in physics and astronomy—eventually collapsed under empirical pressure during the Scientific Revolution.
Foundations of Natural Philosophy:
Aristotle (384–322 BCE) proposed that all knowledge should begin with sensory observation but proceed through logic and categorization.
Four Causes Explained Change:
He taught that everything has a material, formal, efficient, and final cause—linking physical properties to purpose and function.
Geocentrism and Spheres:
Aristotle placed Earth at the center, surrounded by concentric, crystalline spheres carrying planets and stars.
Natural Motion Doctrine:
He claimed heavy bodies naturally fall, light ones rise, and celestial bodies move in perfect, eternal circles.
No Vacuum Allowed:
Aristotle denied the existence of a void. Nature, he argued, abhors a vacuum—a belief lasting well into the 17th century.
Elements and Qualities:
He believed everything was made of four elements—earth, water, air, fire—each with qualities (hot, cold, wet, dry) that defined behavior.
Adopted by Scholastics:
Medieval Christian thinkers like Thomas Aquinas (1225–1274) synthesized Aristotle’s system with Christian doctrine, solidifying his authority in universities.
Physics Without Mathematics:
Aristotelian science relied on qualitative logic rather than measurement. It lacked predictive power and empirical rigor.
Challenged by Experience:
Galileo’s experiments disproved his physics of motion. Telescopic discoveries shattered the idea of immutable heavens.
Kepler and Newton Complete Break:
Elliptical orbits and universal gravitation replaced Aristotle’s teleological, Earth-centered cosmos with a mechanistic universe governed by laws.
Why It Matters:
Aristotelian authority exemplified how coherent but untested systems can dominate thought. The Scientific Revolution marked a shift from authority to evidence.
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