1. Astronomers
Foldable review 

2. Ptolemy 90AD to 168 AD
Thought like ancient Greeks that Earth was the center of the Universe- geocentric model 

3. Copernicus     
Further developed Aristarchus heliocentric model (sun centered) by making a model of how the planets move around the sun 

4. Said planets move in perfect circles
Brahe                         
Said planets move in perfect circles

5. Used Brahe's observations to find planets orbit in ellipses
Kepler     
Used Brahe's observations to find planets orbit in ellipses

6. Galilleo                1564 to 1642
Used observations (found four moons orbit Jupiter and Venus has similar phases to the moon) to prove heliocentric model 

7. Newton         1642 to 1727
Confirmed the heliocentric model, proved gravity and inertia work together to keep planets and their moons in motion