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Astronomy Johannes Kepler Moon Mini Sov. Sheet MNH Burundi Cats Domestically Animals Souvenir Sheet and Blue Sky StudiosMozambique Astronomy Johannes Kepler Moon Mini Sov. Sheet MNH Johannes Kepler ( kplr ; German: [johans kpl]; December 27, 1571 November 15, 1630) was a German mathematician, astronomer, and astrologer. Kepler is a key figure in the 17th century scientific revolution. He is best known for his laws of planetary motion, based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. These works also provided one of the