Astronomy_college_course#Ptolemy.2C_Copernicus_and_Tycho_systems
1 The Ptolemaic system was geocentric.
2 The Ptolemaic system was heliocentric.
3 Most ancient Roman and most medieval scholars thought the Earth was flat.
4 Evidence for the Copernican system is that the Earth does not seem to move.
5 The ancient Greeks believed in circular orbits, causing them to devise the epicycle and the deferent.
6 Copernicus was a university-trained Catholic priest dedicated to astronomy.
7 Tycho Brahe argued that the large mass of Earth rendered it incapable of moving so quickly around the Sun.
8 Tycho Brahe argued that the small mass of Earth rendered it incapable of moving so quickly around the Sun.
9 Copernicus shared his heliocentric theory with colleagues decades before he died.
10 In the late 16th century, Tycho Brahe invented his system to resolve philosophical and what he called “physical" problems with the heliocentric theory.
11 An argument used to support the geocentric model held that heavenly bodies, while perhaps large, were able to move quickly.
12 Tycho tended to favor religious arguments over scientific arguments when justifying his opinions about the geocentric/heliocentric controversy.
13 Tycho proposed an earth-orbiting sun with the planets in orbit around that moving Sun.
14 Tycho argued against the concept of an earth-orbiting sun with the planets in orbit around that moving Sun.
