ARISTOTLE

• 384-322 BCE
• Everything rotated around the earth
• Geocentic model

ARISTARCHUS

• 310-230 BCE
• Was a Mathematician
• Heliocentric theory
• Tried to mesure the distance between the earth and moon

PTOLEMY

• Lived in Egypt 100-170 CE
• Wrote a book
• Wheels on wheels theory
• Retro grade motion

COPERNICUS

• Data was based on observation
• 1473-1543
• Made ptolemy models less complicated
• Sun was in the center

KEPLER

• 1571-1630
• German mathematician and astronomer
• Kepler laws

GALILEO

• Scientific method
• Improved the telescope
• Showed that earth was not the only planet that could orbit
• Suported the heliocentric model

GEOCENTRIC

HELIOCENTRIC