Synthese 83 (2):317 - 323 (1990)

I argue that Copernicus accepted the reality of celestial spheres on the grounds that the equant problem is unintelligible except as a problem about real spheres. The same considerations point to a number of generally unnoticed liabilities of Copernican astronomy, especially gaps between the spheres, and the failure of some spheres to obey the principle that their natural motion is to rotate. These difficulties may be additional reasons for Copernicus's reluctance to publish, and also stand in the way of strict realism as applied to De Revolutionibus, although a realistic astronomy may be envisioned as a goal for Copernicus's research program.
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DOI 10.1007/BF00413764
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References found in this work BETA

The Role of Comets in The Copernican Revolution.Peter Barker - 1988 - Studies in History and Philosophy of Science Part A 19 (3):299.
The Phases of Venus Before 1610.Roger Ariew - 1987 - Studies in History and Philosophy of Science Part A 18 (1):81.
Jean Pena (1528-58) and Stoic Physics in the Sixteenth Century.Peter Barker - 1985 - Southern Journal of Philosophy 23 (S1):93-107.

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A Different Kind Of Revolutionary Change: Transformation From Object to Process Concepts.Xiang Chen - 2010 - Studies in History and Philosophy of Science Part A 41 (2):182-191.

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