Plato saving the appearances

• Plato's "Saving the Appearances"

  Addressed the discrepancy between the observed irregularities in planetary motion and the expectation of perfect circular paths
• Plato's "Saving the Appearances"

  Challenged his students to reconcile these differences
• Aristotelian System


  Suggested celestial bodies moved uniformly in circular paths due to aether
• Aristotle's system couldn't explain irregularities like changes in brightness or distance from Earth, challenging his theory
• Heliocentric Theory

  Aristarchus proposed the heliocentric theory, placing the sun at the center with planets orbiting it
• The heliocentric theory contradicted philosophical beliefs and lacked mathematical support
• Greek thinkers dismissed the heliocentric theory, pointing out flaws like the absence of annual parallax
• Geocentric model


  Posits Earth as the universe's center, with celestial bodies orbiting it
• Heliocentric model


  Places the Sun at the solar system's center, with planets, including Earth, orbiting it
• The geocentric model is an ancient concept supported by figures like Aristotle and Ptolemy
• The heliocentric model is the scientifically supported model and the accepted understanding of our solar system today
• Copernicus


  • Proposed the heliocentric model
  • Suggested that the Sun, not the Earth, was at the center of the universe
  • Proposed that the Earth rotates on its axis and revolves around the Sun
• Ptolemy


  • Developed the geocentric model
  • Posited that the Earth was at the center of the universe
  • Introduced epicycles to account for observed phenomena like retrograde motion
• Aristarchus


  • Suggested the heliocentric theory centuries before Copernicus
  • Proposed that the Earth and other planets orbit the Sun
• Eudoxus


  • Introduced a complex system of concentric spheres to explain the movements of celestial bodies
  • Each planet was attached to multiple spheres, each rotating at different speeds, to account for the observed motions of the planets
• Aristotle


  • Argued for a geocentric model with the Earth at the center of the universe
  • Believed in a series of nested spheres, with the Earth at the center and the stars on the outermost sphere
  • His ideas heavily influenced medieval cosmology
• While Capernicus and Aristarchus advocated for a heliocentric model, Ptolemy, Eudoxus, and Aristotle favored a geocentric one
• Each model aimed to explain the motions of celestial bodies but differed in their underlying assumptions and complexities
• 3 greek philosopher that propose "GEOCENTRIC THEORY"

  Aristotle, Ptolemy, Eudoxus
• 2 Greek Philosopher that proposes "Heliocentric Theory"

  Copernicus and Aristarchus
• Aether


  It was proposed in ancient Greek philosophy and was considered the material that makes up the heavens and the celestial bodies.