Gravitation Waltz of Plan

Gravitation Waltz of Plan -...

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Gravitation and the Waltz of the Planets 1. Models of the Universe a. The Geocentric model was the Greek model in which they thought the earth was the center of everything. i. Everything would revolve around the earth. ii. It could tell you where the planets would be, when the sun would rise, et cetera. The problem was that Mars goes into retrograde where it appears to move backwards. The way they fixed this was that they made a model where the earth was still in the center and they made a perfect circle called an epicycle. You would see the planet moving in its circular orbit This would show where the planets were in retrograde b. Copernicus came along and said the universe is not that complicated i. He came up with a heliocentric model where the sun was in the center and the planets orbited the sun. If one planet was closer to the sun and moved faster, then the perception would change appearing in retrograde. ii. The problem was that hey was going along the line that everything was perfect and circular. We now know that this is wrong. iii. He ended up having to fall back on epicycles. iv. With this heliocentric model, he figured out mathematically how far from the sun the planets were. They were incredibly close to what we now know are true. c. Tycho Brahe i. He was one of the best observers during his period. He had unlimited funds from the Dutch government so he got whatever he wanted. He observed Parallax. 1.
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Gravitation Waltz of Plan -...

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