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Discoveries > Kepler


Kepler (1571-1630)
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Kepler (1571-1630) used the observations of Tycho Brahe to show that Mars traveled on an elliptical orbit.

He will propose then the laws that bear his name :

- each planet describes an ellipse where the Sun occupies one of the focus ;
- the areas described by the planet-Sun radius vector is proportional to the time employed to describe them ;
- the semi-major axis a and the revolution period around the Sun T are connected by a3/T2=the same constant for all planets.