Summary Chapters 4-5_2

Summary Chapters 4-5_2 - Chapter 4: The Origin of Modern...

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Chapter 4: The Origin of Modern Astronomy Ancient civilizations used astronomy for: Daily timekeeping Tracking the seasons and calendar Monitoring lunar cycles Monitoring planets and stars Predicting eclipses Reasons: for practical purposes, including agriculture for religious and ceremonial purposes Greek Astronomy: (Ptolemaic Solar System) 1.Tried to understand nature without resorting to supernatural explanations (debate and challenges of ideas) 2. Used mathematics to give precision to their ideas. 3. Applied reasoning to observations. 4. Applied models Could not see stellar parallax Could not explain retrograde motion Copernicus Heliocentric theory Planets in circular orbits Tycho Brahe Detailed naked eye observations of planets and stars Believed geocentric model Believed the geocentric theory Did not observe a stellar parallax • Earth stood still (geocentric) Kepler’s Laws of motion 1. Planetary orbits are elliptical with Sun at one of the foci. 2. Planet sweeps out equal areas in equal times during the orbit.
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Summary Chapters 4-5_2 - Chapter 4: The Origin of Modern...

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