Tycho Brahe (1546-1601), a Dane, spent nearly his entire life making careful measurements of the positions of the stars and planets. Most of his work was done at Copenhagen under the patronage of the Danish king. He developed and refined astronomical instruments to an accuracy that was far superior to anything previously done. In his late years at Prague, he started on the reduction to order of the systematic observations that he had made over a period of decades. In 1600 a young German mathematician and astronomer, Johannes Kepler (1571-1630), visited Tycho and then stayed to help in the mammoth task that had begun. [excerpt]
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Bloom, Robert L. et al. "4. Kepler. Pt. VIII: The Development of Modern Science." Ideas and Institutions of Western Man (Gettysburg College, 1958), 47-52.