Kepler''s laws of planetary motion, Science

Kepler's  Laws of Planetary Motion:

Further support to the heliocentric model came from the work of Johannes Kepler at around the same time as Galileo's observations. Kepler, a German astronomer, was  


703_Keplers  Laws of Planetary Motion.png

trying to work out a theoretical model which explained all observations of planetary motion. The most accurate observations of apparent planetary positions had been made bv Tvcho Brahe.  

Brahe invited Kepler to work with him. He  recommended that Kepler study the planet Mars because its motion seemed most anomalous, most difficult to reconcile with an orbit made of  circles. Further, planets in circular orbits ought to move with constant speed. But Kepler found that their speeds changed with their distance from the Sun. After years of  trial and error, he found that the only explanation of  the observed movement of Mars was that its orbit was an ellipse with the Sun at one of  its foci. Thus, the idea of  circular orbits was abandoned. Kepler eventually succeeded in explaining Brahe's  observations which could all be expressed simply, in  the form of three law$ of  planetary motion.

Kepler's laws removed the main objection of  the Copernican model, that this model could not give an accurate description of  the observed path of  the planets. These laws also led to the rejectioli of Pythagorean-Platonic  view of  the heavens showing only perfect circular motions, which even Copernicus had retained. By.the  end of  the seventeenth century the heliocentric model of  the universe came to be accepted generally. Interestingly,  the physical proof  of  the movement of  the Earth came when  it was no longer necessary, because by  then everybody had already accepted that the Earth moved around the Sun. 

Posted Date: 9/28/2012 1:09:28 AM | Location : United States

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