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Astronomy: Chapter 14

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David Mendoza

on 14 June 2011

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Transcript of Astronomy: Chapter 14

As we all know, the sun is at the center of the solar system,
but it was not always that way. In about A.D 140, the Greek astronomer Ptolemy further developed the geocentric model. Many people, including the church argued whether the Earth was at the center of the solar system, or the Sun at the center of the solar system. In 1543, a Polish astronomer named Nicolaus Copernicus further developed the idea of a heliocentric model. Copernicus worked out the arrangement of the known planets and how they move around the Sun. Astronomy: Observing the Solar System Kepler was another scientist, who supported the heliocentric model,and used Tycho Brahe's, his partner's data to develop three laws that describe the motions of the planets. Keplers' Three Laws are:
1.The orbit of every planet is an ellipse with the Sun at one of the two foci.
2.A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3.The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. Tanks for watching!! Geocentric Model: The theory
that the Earth was at the center of
the universe, and everything revolves
around it. Heliocentric Model: The theory
that the Sun was at the center of
the universe, and everything around
it revolves around the Sun.
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