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Johann Kepler

Johann Kepler (1571-1630) was a great German Astronomer and Mathematician. He found the Planet Mars is moving around the sun in an ellipse shape but not in a perfect circle. In the 17th century, he created a great scientific revolution in the field of Astronomy. His well-known theory called "Kepler's laws of planetary motion and Kepler conjecture".

His famous works are "Harmony of the world, The Sacred Mystery of the Cosmos, New Astronomy, On the New Star in Ophiuchus's Foot  and Epitome of Copernican Astronomy"