In his Astronomia Nova 1609, Kepler pronounced:
1st Law - The orbit of a planet is elliptical and the Sun the source of motion is in one of the foci of this ellipse.
2nd Law - The apparent diurnal arcs of one eccentric are almost exactly proportional to the square of their distances from the Sun.
3rd Law - The periodic times of any two planets are to each other exactly as the cubes of the square roots of their mean distance.
Keplers First Law
Keplers Second Law
Keplers Third Law