PRESENTATION OUTLINE
Johannes Kepler
-He realized that requiring planetary motions to be exactly circular did not fit the observations perfectly
-Kapler's Laws
1. Planetary orbits are ellipses with the sun at one focus
2. Planets move faster in their orbits when closer to the sun
3. Relates the distance of a planet from the sun to the time it takes to go once around its orbit
Aristarchus
- Proposed a heliocentric model of the solar system
- Attempted to measure the relative distances to the moon and sun
Nicolaus Copernicus
- felt that Ptolemy's model of the solar system is too complicated
- he used Ptlomely's wheels on wheels system
- his model fit observations better than Ptolemy's
- his model is seen as the first step in the development of modern models
Galileo
- made scientific methods
- made significant improvements to the newly invented telescope
- views celestial objects
- made us aware of the Galilean satellites
Ptolemy
- developed a detailed geocentric model
- believed that a celestial body traveled at a constant speed in a perfect circle
Aristotle
- thought the earth was the center of all things
- his model placed the moon, sun, planets and stars on a series of circles that surrounded earth
- he thought if earth went around the sun, then the relative position of stars would change as earth moves
