Early History - Sun at center of Solar System planets orbit...

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Early History   about 1700 BC . ...........  Babylon o early civilization  with written records o knew length of year to within 4 minutes o knew motion of sun and moon 500 - 1000 BC . ............ China, India, Americas o detailed observations of planets, sun and moon about 350 BC . ..............  Greece o Aristotle Earth is sphere at center of Universe all heavenly objects orbit in perfect circles about Earth about 200 BC . ..............  Greece o Eratosthenes determined size of Earth about 150 AD . ..............  Greece o Ptolemy revised Earth-centered model could make very accurate predictions of planet positions his model survives for 1000 years !!! History: Copernicus, Brahe and Kepler about 1500 . ..................  Poland o Nicolaus Copernicus developed model with 
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Unformatted text preview: Sun at center of Solar System planets orbit about the Sun in perfect circles Earth rotates stars are very far away o Copernican model explained: order of planets from Sun retrograde motion daily motions from Earth's rotation o Copernican model still had some problems: predictions of planet positions were no more accurate than Ptolemy (because of circular orbit assumption) • about 1550 . ................... Denmark o Tycho Brahe great observer (still no telescopes) produced excellent data • about 1600 . ................... Germany / Austria o Johannes Kepler studied Brahe's data modified Copernican model orbits are ellipses - not circles...
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Early History - Sun at center of Solar System planets orbit...

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