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Ptolemy
(100 A.D.)
Greek mathematician
Geocentric (earth at the center) universe theory
Believed in a circular path
Copernicus
(1470-1543)
Heliocentric (sun in the center) universe theory
Believed in a circular path
Galileo
(1564-1642)
Used a telescope to gather evidence to support the heliocentric theory
Believed in a circular path
Brahe
(1546-1601)
Gathered precise measurements of the positions of the planets
Kepler’s 1st Law
The orbit of the planets is an ellipse with the sun at a foci
Kepler’s 2nd Law
Planets cover the same area of space in the same amount of time
Kepler’s 3rd Law
(Ta/Tb)² = (Ra/Rb)³