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THE DEVELOPMENT OF MODERN ASTRONOMY Greek Astronomy All advanced cultures around the globe had astronomy. Greek philosophy and cosmology were merged together.   The geocentric universe The heavens were perfect and unchanging. The earth was the center of the Universe and not moving. Earth was a sphere (diameter could be measured). Order of objects from Earth: Moon Mercury Venus Sun Mars Jupiter Saturn Fixed Stars (and Primum Mobile) Order determined by sidereal period Heavenly bodies move on sphere How did Greeks “know” Earth was at the center? No parallax for stars Consistent with Aristotle’s physics Even though Aristarchus argued for heliocentric system Astronomers measured positions of stars, Sun, Moon, planets to  make a calendar predict eclipses astrological prediction Greatest systemetizer of motions was  Ptolemy . Ptolemy made a system that allowed for accurate prediction 
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This note was uploaded on 03/02/2011 for the course ASTRO 10 taught by Professor Norm during the Spring '06 term at University of California, Berkeley.

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