9.28.06 - o Removed gods from astronomy o Arabs translated...

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Space Science 9/28/06 Claudius Ptolemy o Born in Egypt o Died in Alexandria, Egypt o Astronomer, geographer o Wrote “The Great System” and “The Almagest” Ptolemaic Epicycle o The big circle that mars rotates on is the deferent o There are small circles(epicycles) that rotate of the deferent o Thought that the earth was at the center of the universe Eratosthenes: Measurement of the Earth Size in 240 BC o Knew that the sun was directly overhead (at the zenith) in Syene on summer solstice o Observed the sun 7* south of the zenith in Alexandria on the same day o Knew the distance between cities-5000 stadia(measured in respect to the stadium) Greeks Since 240 BC
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Unformatted text preview: o Removed gods from astronomy o Arabs translated Greek material that was burned- developed alebra Renaissance o Rediscovery o Sailing related to the stars Copernicus o Wrote a book that said There is not centre of universe The apparent retrograde motion of the planets is caused by the motion of the earth from which one observes Modern cosmological principles o Every direction is relative o There is no unique place in the universe(isotropy) o Wherever one stands in the universe, the universe looks the same(homogeneity) Johannes Kepler o Mathematician who wanted to become a priest o Assistant to Brahe...
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This note was uploaded on 04/08/2008 for the course ENG 2a taught by Professor Humancore during the Winter '06 term at UC Irvine.

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