In 1588 Tycho Brahe published a book on the comet of 1577 De mundi aetherei recentioribus phaenomenis, which contained the first published account of his new geo-heliocentric planetary system, with all the planets revolving around the Sun and the Sun in turn revolving around the stationary Earth. In the Tychonic system the orbits of Mars and the Sun intersected, which was made possible by replacing the traditional solid, real spheres with the fluid heavens. Three years later in Ferrara (1591) the first note on the Tychonic system appeared in a published book. Francesco Patrizi briefly described it in his Nova de universis philosophia at the end of his overview of the history of astronomical systems. In my paper I will investigate Patrizi’s criticism of astronomy (according to him all astronomers, including Tycho Brahe, believe that the stars are fixed in the heavens sicut nodi in tabula), and how it happened that Patrizi completely overlooked one of the crucial achievements of Tycho Brahe’s book (fluidity of heavens)
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