29 - Natural Science Lecture Test Feb. 12th. 1/29/2008...

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Natural Science Lecture 29/01/2008 13:00:00 Test Feb. 12 th . Conjunction, Opposition Planet is in conjunction with the Sun if it is about zero degrees away from the sun. Planet is in opposition to the Sun if it is 180 degrees away from the sun. Elongation – the angle between the sun and another celestial object as observed from earth. Inferior Planets Mercury, Venus Always < 48 degrees away from the sun May have retrogression when in conjunction with Sun Superior Planets Mars, Jupiter, Saturn Vary from 0 to 180 degrees away from the Sun Always in retrogression when in opposition to Sun. Ptolemy’s Model – earth is near the center. Model of Nicolaus Copernicus “Heliocentric” model – near the center Earth rotates daily and revolved yearly around the Sun. Used epicycles, deferents, eccentric (somewhat off the center) Did NOT use the equant (non uniform circular motion) Used uniform circular motion!
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De Revolutionibus Orbium Clestium (1543) – His great work. Inferior planets are inner planets
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29 - Natural Science Lecture Test Feb. 12th. 1/29/2008...

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