AY 101 - Sept 6 Lecture Notes
AY 101 - Sept 6 Lecture Notes AY 101
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This 1 page Class Notes was uploaded by Savannah L on Tuesday September 6, 2016. The Class Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Jeremy Bailin in Spring2015. Since its upload, it has received 54 views. For similar materials see AY 101 - Intro to Astronomy - Jeremy Bailin in Astronomy at University of Alabama - Tuscaloosa.
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Date Created: 09/06/16
AY 101 LECTURE—TUESDAY, SEPT 6 Planets – appear point-like lights, like stars, but orbit Ancient Greek View – nested heavenly spheres rotating around a celestial earth Retrograde Motion – After a while, planets appear to move backward for a little bit and then continue to move forward Proved to be a problem for ancient greeks Their solution: epicycles – planets move on small circles, small circle move on bigger circles o This idea wasn’t enough, so it required epicycles on epicycles, and therefore became very complex Aristarchus (260 BC) – started the idea of the heliocentric (sun-centered) model Many scientists considered but rejected this idea Mainly rejected because the sun and stars appeared to be moving in the sky, and they couldn’t adapt to the idea that the earth was the one moving Copernican Principle – we are not in a special place in the universe 1. “The Earth is the center of the universe” then: 2. “The Sun is the center of the universe” then: 3. “The Milky Way is the center of the universe” then: 4. “The Universe is infinite with no preferred vantage point” Copernicus - observed the sun as the center Tycho Brahe – most precise naked eye observations of planets, moon, supernova, comets Kepler – created model that could explain Tycho’s observations using elliptical orbits (most orbits are nearly circular but not perfect circles) KEPLER’S LAWS 1. Planets orbit in elliptical orbits with Sun at the focus 2. The planets move faster when closer to the sun 3. More distant planets orbit the sun slower (not necessarily because they have a larger distance to cover, which they do, but they actually move slower than closer planets) Galileo’s Discoveries: 1. Demonstrated that we feel acceleration, not motion (answering why we don’t feel the earth move) 2. Observed all phases of Venus, so Venus must sometimes be behind the sun 3. Discovered moons of Jupiter (proved the earth is not the center of everything)
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