Slide 1Slide 2Slide 3Slide 4Slide 5Enter the Greek PhilosophersPhilosopher – Lover of WisdomGreekAstronomy.pptAnaximander (611 – 647 BC): Believed that the sun, moon, and stars were made of fire seen through holes in a moving dome in the sky. Pythagoras (569 – 475 BC): Nature and natural phenomena can be described mathematically, and is natural laws are to be deduced by pure reasoning. Pure mathematics provided glimpses of the realm of the gods.Democritus (460 – 370 BC): Proposed that the Milky Way was composed of many distant unresolved stars. Also, there are a large number of worlds which wander through space. These worlds were formed by diffuse matter which exists in space.Aristotle (384 - 322 B.C.) developed an early model of the cosmos based on the concept of uniform circular motion. To account for the motions of the stars, sun, moon, and the five known planets, his model used 55 spherical shells each centered on the earth. Enter the Greek PhilosophersAristarchus (310 - 230 B.C.) His measurements determined that the sum was bigger than the earth. Argued it sun was bigger, it would be harder for it to move than the earth. Introduced heliocentric (sun centered) model of the universe. Explained phases of the moon. Very little is known of his work.Enter the Greek PhilosophersReference: PHY250 website Powerpoints, Lunar Phases and EclipsesHipparcus (165 - 127 B.C.) Accounted for retrograde motion of planets by introducing deferent and epicycle.Enter the Greek PhilosophersPtolemy (140 A.D.) Refined the astronomical model by introducing the equant.The End of Greek
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