lecture10 - Astronomy Picture of the Day Plumes of ice...

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Unformatted text preview: Astronomy Picture of the Day Plumes of ice erupting from Saturns moon Enceladus Gravitation and Planetary Orbits Ancient geocentric models The Copernican revolution Keplers laws of planetary motion Newtons laws of gravitation The speeds of planetary orbits The Planets Marss path across the sky Marss path across the sky Planetary motions Earth takes 1 year to orbit the sun; Mars takes 1.88 years How does Mars appear to move relative to stars on the celestial sphere? Sun Earth Mars Retrograde motion As Earth and Mars orbit the sun, how does Mars appear to move along the celestial sphere? Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Retrograde motion Ancient models of the universe Most ancient observers like Aristotle (384-322 BC) thought that the earth was at the center of the universe This is called a geocentric model Ptolemy: Greek astronomer around 140 AD Ptolemys geocentric model was the dominant model of the universe used in European civilization for almost 1500 years...
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This note was uploaded on 04/20/2008 for the course PHYS 20A taught by Professor Staff during the Fall '02 term at UC Irvine.

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lecture10 - Astronomy Picture of the Day Plumes of ice...

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