Kepler is responsible for the discovery of elliptical rotations.
Johannes Kepler (December 1571 – November 1630) was a German astronomer, astrologer, mathematician, and music writer. He was a vital figure in the 17th-century Scientific Revolution, best known for his laws of planetary motion and the book he wrote, Astronomia nova, Epitome Astronomiae Copernicanae, and Harmonice Mundi.
Kepler was basically a mathematics teacher in Graz, where he became an associate of Prince H. Ulrich von Eggenberg. Later on, he became an assistant to the astronomer Tycho Brahe in Prague and eventually the imperial mathematician to Emperor Rudolf II and his two successors, Matthias and Ferdinand II.
Elliptical rotation is basically the motion of a point on an ellipse through some angle about a vector.
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