Astronomy 50: The Solar System Readings for Sky Motions
Text Ch. 2.1 - 2.2; p. 95-105
These pages also help with visualization:
Guide to Celestial Sphere
Apparent Star Motions from different latitudes
Apparent Motion of the Sun
Planetary Motions
Animations of Retrograde Motion and Models
Sky Charts
Schenectady at Heavens-Above.com
Sky View Cafe
More on history of development of Heliocentric Universe:
Geocentric Universe
Heliocentric Universe
Physics and Astronomy Department Home Page
Union College Home Page
Rebecca Koopmann's Home Page
Last updated: March 30, 2013