ASTR 114 Lecture Notes - Lecture 6: Apparent Retrograde Motion, Geocentric Model, Minute And Second Of Arc
21 Oct 2018
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Document Summary
Greeks were the rst people known to make models of nature. (eg. greek geocentric model) Heavens must be perfect : objects moving on perfect spheres or in perfect circles. But this made it dif cult to explain apparent retrograde motion of planets. Review: over a period of 10 weeks, mars appears to stop , back up ,then go forward again. The most sophisticated geocentric model was of that of ptolemt - the ptolem c. According to polemic model, planets moves around earth and move on a small circle really do go backward. With the fall of constantinople (istanbul) in 1453, eastern scholars headed west to. Europe, carrying knowledge that helped ignite the european renaissance. Used model to determine layout of solar system(planetary distances in au) But the model was no more accurate than the ptolemaic model in predicting planetary positions, because it still used perfect circles. Compiled the most accurate (one arc minute) naked eye measurements ever made of planetary positions.
