EARLY MODEL OF THE UNIVERSE

• Plato & Aristotle 


  They described Earth and heavens as spherical
• Ferdinand Magellan and Juan Sebastian Elcano


  Were given credit for circumnavigating the world and proving Earth is not flat or corner.
• Pythagoras & Eratosthenes


  Also proved that earth is spherical
• Eudoxus of Cnidus


  First astronomer to explain the retrograde motion of the planets
• Aristotle


  He patterned his model from Eudoxus Model
• Earth was composed of 4 elements: WATER, AIR, FIRE, EARTH
• Aristarchus of Samos 


  Greek astronomer who made the first attempt to create a heliocentric model
• Claudius of Ptolomeus


  it is more refined than another geocentric model because his model can explain the motion of bodies accurately
• Epicycles-Small spheres
• Deferent= Larger sphere