History of Magic and Experimental Science, The Sixteenth by Lynn Thorndike

By Lynn Thorndike

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Pp. 149-51. 241 It is reprinted with collation of four earlier MSS in the Edizione Nazionale of Le opere di Galileo Galilei, Florence, I I (1891), 203-55: Trattato della sfera ovvero cosmografia. 63 it adhered strictly to the Ptolemaic system and represented the earth as immobile at the center of the celestial sphere. 240 In it he adverts a number of times to Copernicus and Tycho Brahe and confutes the opinion that the earth moves. He states that he has discussed this more fully in his treatises on meteorology247 and human opinions,248 as well as in a special treatise De motu terrae.

What is denominated "Orbis deferens terre; lungque et regionis sublunaris" in the diagram includes only the region between the spheres of Mars and Venus. The sublunar region is clearly comprised entirely within this orb and constitutes as usual the spheres of tire, air, water and earth. The only space "below the moon" is that between it and the earth. Neither Copernicus nor Giuntini thought that sublunar objects would fall towards the central sun rather than towards the earth. There is however, a curious feature of Giuntini's summary of the Coperni¬ can theory which McColley has not re¬ marked.

207 The only such model of which Tycho could think was a small one he had once seen in the possession of Schreckenfuchs and which was supposed to illustrate both the Ptolemaic and Copernican hypotheses. ^ This claim has recently been allowed by Grant McColley,212 who has even credited Raymarus Ursus with a fourth system of the world to rank with the Ptolemaic, Copernican and Tychonian. , VII, 85: letter to Tycho of June 12, 1584. , VII, 79. Although placed before it in Dreyer's edition, this would seem to be Tycho's reply to the letter mentioned in the preceding note.

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