L5 - -First true quantitative/mathematical model of...

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10/8/09 What Copernicus’s Model did not do: 1) Predict positions and planets any better than Ptolemy (only more simply) 2) Explain things using gravity Tycho Brahe (1546-1601) - First to record a supernova - Built ‘modern’ observatory (resolution of 1') - Took painstaking records of positions of planets, stars for last 25 years of life Johannes Kepler (1571-1630) - Used Tycho’s observations to make 3 laws of planetary motion - First Law 1) Planets go around sun in ellipses, sun is at one focus of the ellipse 2) A planet sweeps out equal areas in equal times 3) Planets further from the sun experience longer orbital periods (how long their year is) according to p 2 = a 3 p = period (years) a = distance from planet to sun (AU) - Second Law planets travel faster when they’re closer to the sun in their orbit
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Unformatted text preview: -First true quantitative/mathematical model of universe Galileo (1564-1642)-First to use a telescope for astronomy-Discovered 4 moons of Jupiter o Disproved Ptolemaic model once and for all-Observed sunspots o Saw sun wasnt perfect sphere (changes)-Published The Starry Messenger Newton (1642-1721)-First real physicist-Law of Universal Gravitation o Explained why the planets orbit the sun o Keplers laws are direct consequence of gravitation-Wrote The Principia (first physics text)-First physical model of universe based on physical laws Einstein (1879-1955)-Special Relativity (1905) o Explained motion at high speeds o General relativity of gravity...
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This note was uploaded on 02/17/2010 for the course PHY 115 taught by Professor Weinbeck during the Spring '09 term at BC.

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