On the Heavens

Interesting Facts

• The book «On the Heavens» is one of Aristotle's foundational works, where he presents his views on the structure and nature of the universe.
• In this book, Aristotle asserts that Earth is spherical and at the center of the universe, corresponding to the geocentric model of the world.
• The book examines the nature of celestial bodies, and Aristotle introduces the concept of aether as the fifth element from which stars and planets are made.
• Aristotle divides the world into two parts: the sublunary world, where changes and movement occur, and the superlunary world, which is unchanging and eternal.
• The work «On the Heavens» had a significant influence on medieval astronomy and philosophy, and its ideas remained dominant until the time of Copernicus and Galileo.