Test 1 Notes - 1/16 Pre Telescope Observation and...

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1/16 Pre Telescope Observation and Accomplishment (2.1-2.5) 1. Ancient “naked-eye” observers noted 5 objects that moved irregular (forward and backward) relative to the fixed stars. Perplexing, because skies thought to be unchanging. Called these wanderers planets- mercury, Venus, mars, Jupiter, and Saturn 2. Greeks were first to take up challenge of describing their motion religion/philosophies beliefs of Aristotle (others) had heavens being “perfect”, so motion had to be uniform and circular (perfect geometric form) Earth was considered center of Universe. 3. Ptolemy (2 nd century) devised epicycle (circle) system which remained popular for 1400 years 4. Copernicus (early 16 th century) revisited earlier idea of Aristarchus (300 BC) of Sun centered system (heliocentrism), but continued with planets orbiting in circles. 5. Tycho Brahe offered compromise system of planets orbiting Sun, sun and moon orbiting Earth. Still didn’t quite fully explain unique movements (Late 16 th century) 6. Kepler (Early 17 th century) finally formulated correct orbital movements as ellipses, not circles. 7. Galileo “confirmed” heliocentrism by telescopically discovering Jupiter moons\ 8. Newton (Late 17 th Century proposed gravitational force keeping planets orbiting the sun. 1/18 Keys to Himalaya’s of Venus Reading demonstrates difficulty in seeing planetary objects with a telescope. 1. Position in our sky a. low above horizon-must deal with looking through our thick, sometimes distorting atmosphere. Venus also has very thick atmosphere. b. its closeness to sun also produces difficulties in view. c. its size varies due to its (& our) movement around the sun sometimes closer or farther away. 2.Telescopic considerations/factors
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This note was uploaded on 04/18/2008 for the course UI 416 taught by Professor Cwick during the Spring '08 term at Southeast Missori State University.

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Test 1 Notes - 1/16 Pre Telescope Observation and...

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