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29.1 Models of the Solar System

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Katelynn Dorn

on 27 April 2015

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Transcript of 29.1 Models of the Solar System

Kepler's Laws
hired by Tyco Brahe to explain his observations in equations
3 Laws:
law of Ellipses
law of Equal Areas
law of Periods
Law of Ellipses
ellipse- path of orbit
oval determined by two points (foci)
the sun is one focus
perihelion- orbit closest to sun
aphelion- point farthest from sun
astronomical unit- average of these
Law of Equal Areas
Earth moves faster when closer to sun and slower when farther from sun
a line from center of sun to center of earth sweeps through equal areas in two different places as long the time frames are the same
Law of Periods
orbit period- time required for planet to make one rev. around sun
r^3 = p^2
If Jupiter is 5.2 AU's from the sun, what is the length of its period?
Newton's Application of Kepler's Laws
inertia- tendency of body to move in a straight line
gravitational pull of sun keeps planets in orbit
Ancient Models
Aristotle- geocentric
did not explain retrograde motion- heavenly bodies reversing direction
Ptolemy- each planet had 2 revolutions
around axis
epicycles- moving in a series of small circles
29.1 Models of the Solar System
Copernicus's Model
heliocentric- planets revolve around sun
each planet moves at a different speed but same direction around sun
Galileo confirmed this model with telescope in 1600s
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