People Flashcards
0
Q
Eratosthenes
A
First to guess circumference of the Earth
1
Q
Aristarchus
A
First to believe heliocentric
2
Q
Hipparchus
A
Star catalog and measured length of year
3
Q
Aristotle
A
Believed the Earth is round
4
Q
Claudius Ptolemy
A
Ptolemaic System accounted for the movements of planets
5
Q
Galileo Galilei
A
Discovered four moons, planets are circular disks, Venus has phases, Moon was not smooth, and Sunspots
6
Q
Sir Isaac Newton
A
Universal Gavitation
7
Q
Johannes Kepler
A
Laws of Planetary Motion:
- Planets move in an ellipse
- Sun sweeps equal area in equal time
- Square the length the orbital period equals its distance to the Sun