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CHRISTIANSON, JOHN ROBERT

On Tycho's Island. Tycho Brahe and his Assistants, 1570-1601

Bogantikken - Roskilde Antikvariat
ros189873
Cambridge University Press 2000 451p.Sider. Publishers cloth in dust jacket Nice copy Illustr. in b/w. Tycho Brahe (born Tyge Ottesen Brahe] 14 December 1546 - 24 October 1601), generally called Tycho for short, was a Danish astronomer of the Renaissance, known for his comprehensive and unprecedentedly accurate astronomical observations. He was known during his lifetime as an astronomer, astrologer, and alchemist. He was the last major astronomer before the invention of the telescope. He worked to combine what he saw as the geometrical benefits of Copernican heliocentrism with the philosophical benefits of the Ptolemaic system, and devised the Tychonic system, his own version of a model of the Universe, with the Sun orbiting the Earth, and the planets as orbiting the Sun. In De nova stella (1573), he refuted the Aristotelian belief in an unchanging celestial realm. His measurements indicated that ""new stars"" (stellae novae, now called supernovae) moved beyond the Moon, and he was able to show that comets were not atmospheric phenomena, as was previously thought. In 1597, Tycho was forced by the new king, Christian IV, to leave Denmark. He was invited to Prague, where he became the official imperial astronomer, and built an observatory at Benátky nad Jizerou. Prior to his death in 1601, he was assisted for a year by Johannes Kepler, who went on to use Tycho's data to develop his own three laws of planetary motion.
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