Tycho Brahe-
He was born on December 14, 1546 and died on October 24, 1601. He made a remarkable star catalogue of over 1000 stars. This was not the biggest catalogue in the number of stars, but in accuracy. His improvements of methods and accuracy in observations was very significant. He proved that comets are not objects in the atmosphere. He showed irregularities in the moons orbit. His wall quadrant and other instrument became widely copied and lead to improved stellar instruments. Kepler used Tycho Brahe's observations when he constructed his famous laws of planetary movement.
Source: http://www.nada.kth.se/~fred/tycho/index.html
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