universal gravitation
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12 Terms
Ptolemy
Greek mathematician
Ptolemy discovery
Geocentric universe (theory) (Earth is center of universe)
Ptolemy
Circular orbits (other planets)
Copernicus
Heliocentric universe (theory) (SUN is center of universe)
Copernicus
Circular orbits
Galilieo
Used the telescope to gather data to support the heliocentric universe theory
Galilieo
Circular orbits
Brahe
Gathered precise measurements of the positions of the planets.
Kepler 1st law
The orbits of the planets are elliptical and the Sun is at one of the foci (Eccentricity almost a 0, close to circular orbit)
Kepler 2nd law
planets cover the same area in the same amount of time (The closer the planet is to the sun, the faster it moves)
Kepler 3rd law
(Tₐ / Tᵦ)² = (rₐ / rᵦ)³, shows the relationship between a planet’s orbital period and its distance from the Sun
Chronological order
Ptolemy → Copernicus → Galilieo → Brahe → Kepler
Note 
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