astronomers
Published on Nov 19, 2015
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PRESENTATION OUTLINE
Aristotle
- Aristotle's thought earth was the center of all things.
- He thought that if earth went around the sun, then the relative positions of the stars would change as earth moves
- His model placed the moon, sun, planted, and stars on a series of circles that surrounded earth.
- He was a Greek philosopher.
Aristarchus
- He was a Greek astronomer and mathematician.
- Aristarchus is reported to have proposed a heliocentric model of the solar system.
- Aristarchus attempted to measure the relative distances to the moon and sun.
PTOLEMY
- Ptolemy was an astronomer, geographer,and mathematician
- He believed that the celestial body traveled at a constant speed in a perfect circle.
- Ptolemy developed a detailed geocentric model that was used by astronomers for the next 14 centuries.
Copernicus
- His full name is Nicolaus Copernicus.
- Polish astronomer
- He was aware of the heliocentric idea of Aristarchus when he developed the first detailed heliocentric model of the solar system.
Kepler
- Full name is Johannes Kepler.
- He was a German mathematician and astronomer.
- After carefully analyzing observations of the planets, he realized that requiring planetary motions to be exactly circular did not fit the observations perfectly.
