Who was a famous German astronomer?

A famous German astronomer is Johannes Kepler, known for his laws of planetary motion that describe the orbits of planets around the Sun. He played a crucial role in the Scientific Revolution and laid the groundwork for Newton's theory of gravitation. Kepler's work, including his book "Astronomia Nova," significantly advanced the understanding of celestial mechanics. His contributions to astronomy and mathematics have had a lasting impact on the field.