ジョルダーノ・ブルーのの地動説

概要

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Giordano Bruno (1548-1600) is known for his anti-traditional cosmology based upon Copernicus' heliocentric theory, the physical contents of which are said to be made clear by him. For instance, A. Koyre claims, "in the La Cena de le Ceneri, ... Bruno gives the best discussion, and refutation, of the classical - Aristotelian and Ptolemaic - objections against the motion of the earth that were written before Galileo." (From the Closed World to the Infinite Universe, pp. 39-41). In particular, Bruno's description of the experiment of dropping a weight from the top of a mast on a moving ship has been regarded precursory of a well-known discussion in Galileo's Dialogo. Koyre and others who have studied Bruno's heliocentricism have concentrated upon his discussion of the physical problems raised by the earth's motion. They have overestimated the role of that discussion in his heliocentricism. But, it is not his original and is only one (moreover less important for him) subject of his heliocentricism. To understand his heliocentricism properly, we should pay more attention to his discussion of 'il principio' and 'Ia causa' of the earth's motion and his planetary system, because the former is the main reason for his insisting on the earth's motion and the latter, which doesn't save the phenomena but follows his own cosmological principles, clearly shows the character of his heliocentricism.
日本科学史学会の論文
1982-07-30