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Standing on the Shoulders of Giants � 921

Standing on the Shoulders of Giants â�� 921 - •...

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Standing on the Shoulders of Giants – 921 Planets called the wanderers o Normally wander from west to east o East-west movement is called retrograde Ptolemy – explained retrograde motion by having planets on its own circular orbit, in addition to the orbit around the earth o Planets had their own epicycyles Copernicus – took a heliocentric approach o Found that he was able to reproduce retrograde motion and prograde motion with this model o Did not know the model was correct, but did think it was simpler o Aesthetic change- made more sense that Sun was in the middle seeing as how it provides more light o Didn’t allow his books to be published till the day of his death Could cause controversy with the Catholic church
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Unformatted text preview: • Galileo used telescope to prove that universe was heliocentric o Knew that venus was in between Sun and the Earth because it would pass between the two o Used phases of Venus to prove heliocentricity Also disproves Ptolemaic model o Found that moons orbit Jupiter We’re not the only thing bodies orbit around o Sunspots – Cast doubt on the godlike nature of the Sun o Craters on the moon – rough surface like the Earth, not perfect and godlike • Tycho brahe – Committed his life to observing the planets and made very precise calculations • Kepler interpreted Brahe’s data and came up with 3 conclusions o Planets orbit the sun in ellipses...
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