Regiomontanus on ptolemy, physical orbs, and astronomical fictionalism: Goldsteinian themes in the "defense of theon against George of trebizond"

Perspectives on Science 10 (2):179-207 (2002)
: To honor Bernard Goldstein, this article highlights in the "Defense of Theon against George of Trebizond" by Regiomontanus (1436-1476) themes that resonate with leading strands of Goldstein's scholarship. I argue that, in this poorly-known work, Regiomontanus's mastery of Ptolemy's mathematical astronomy, his interest in making astronomy physical, and his homocentric ideals stand in unresolved tension. Each of these themes resonates with Gold- stein's fundamental work on the Almagest, the Planetary Hypotheses, and al-Bitruji's Principles of Astronomy. I flesh out these tensions with an intriguing interpretation of the history of astronomy, in which Regiomontanus contrasts the two-dimensional "eccentric astronomy" attributed to the Almagest and the Arabs with the three-dimensional spheres of the "later" astronomers. A similar contrast reappears when Regiomontanus portrays as a "fictitious art" an astronomy that does not go beyond the accommodation of computations to the appearances. To conclude, I use Regiomontanus's expression to reinstate (pace Goldstein and Barker in this journal, 1998) fictionalism as an actor's category in Osiander and sixteenth-century astronomy
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DOI 10.1162/106361402321147522
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References found in this work BETA
Jane E. Ruby (1986). The Origins of Scientific "Law". Journal of the History of Ideas 47 (3):341.
Bernard Goldstein (1972). Theory and Observation in Medieval Astronomy. Isis: A Journal of the History of Science 63:39-47.
Claudia Kren (1969). A Medieval Objection To “Ptolemy”. British Journal for the History of Science 4 (4):378-393.

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