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• Geocentric model - Wikipedia, the free encyclopedia

  In astronomy, the geocentric model of the universe is the theory that the Earth is at the center of the universe and the Sun and other objects go around it.

• The Galileo Project | Science | Ptolemaic System

  Ptolemaic System. In his Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican of 1632, Galileo attacked the world system based on the ...

• The Galileo Project | Science

  Satellites of Jupiter; Saturn; Tides; Comets; Longitude at Sea; Phases of Venus; Theories; Ptolemaic System; Copernican System; Atomism; On ...