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With the Copernican model accepted, attention turned to providing an explanation of why the movements of the planets were as observed, or why the Moon revolved about the Earth. Half a century had to pass before the explanation was given by Isaac Newton. His work was built on the foundations laid by Johannes Kepler, whose work, and the laws associated with his name, we will look at now.

                                        planetary distances

 kepler's first law

 kepler's second law

 kepler's third law

©Vik Dhillon, 30th September 2009