The History of Astronomy Simplified

Part 1

The System of Concentric Spheres →

Part 2

The Flat Earth; Increase of Spheres; Eccentric Spheres →

Part 3

The Stoical System →

Part 4

The System of Copernicus →

Part 5

Reception to Copernicus' System →

Part 6

Tycho Brahe' System of Astronomy →

Part 7

Kepler's System of Astronomy →

Part 8

The Observations of Cassini →

Part 9

Descartes' System of Astronomy →

Part 9b

The Third Element: Matter →

Part 10

Isaac Netwon's System of Astronomy →

Part 11

Gravity and Mass →