History of Astronomy;  Cosmology; Planetary Systems;  Theories of the World; Ptolemy; Copernicus; Tycho; Kepler; Galileo; Boulliau; Newton; Astronomy Links

World Systems & the Big Guys

The observational implications of a moving earth are not obvious, particularly to 20th-century-city-folk who do not look at the stars and who assume the earth moves as an obvious fact.  To clarify some basic issues, a few clicks may help skeptics visualize aspects of a moving earth and orbital motion.  It will also help recall several key individuals associated with the major world systems from Aristotle & Ptolemy to the time of Newton.

Claudius Ptolemy (fl. 140 AD) - A Planetary Scheme
Nicolas Copernicus (1473-1543) - A Planetary System
Copernican Perspectives - Look & See How it Works!
Tycho Brahe (1564-1601) - Alternative? Compromise?
Johannes Kepler (1571-1630) - Kepler's 'Laws' So-Called
Galileo Galilei (1564-1642) - Apparent Evidence
Ismaël Boulliau (1605-1694) - Alternative? Compromise?
Isaac Newton (1642-1727) - 2 & 3 The Big Guy X3

Great Systems of the World - Antiquity to Newton 
Astronomy Stuff -  Cool Connections
Search the Web - Around the World, Indeed
Real Looking - Observing at University of Florida
Scientific Revolution - Scientific Revolution Home Page 

Opps - Almost forgot!  What is Gravity?    Answer