SOURCE: "Tycho's Book on the Comet of 1577 and His System of the World," in Tycho Brahe: A Picture of Scientific Life and Work in the Sixteenth Century, Dover Publications, Inc., 1963, pp. 158-85.
In the following excerpt, originally published in 1890, Dreyer assesses Brahe 's De mundi—a monograph on the comet of 1577, which contains Brahe's elaboration of his planetary system. Dreyer additionally comments on the state of astronomy in the sixteenth century and the overall significance of Brahe's theories.
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