ASTRO 102 Chapter 3: The Science of Astronomy
14 Feb 2019
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Document Summary
The greek geocentric model of the cosmos the idea that. Synthesized that retrograde motion was caused by planets looping in their own circles thus looking like it"s going backwards. The ideas introduced by copernicus fundamentally changed the way the universe was perceived by us. Suggested that the sun was the center of the universe. Published his work but had the flaw of having an assumption that the universe moved in perfect circles. Tycho rich astronomer that observed the sky and gathered tons of data later examined by kepler. Kepler"s key discovery was that planetary orbits are not circles but instead are a special type of oval ellipse. The foci of an ellipse are objects in space that (later to find out) Later refined to become the ptolemaic model. Retrograde motion: ptolemaic model influences planetary orbit via gravity. Each half of the ellipse is the semimajor axis.
