PLANETARY ORDER IN THE LONG SIXTEENTH CENTURY The Question: Prognostication, Skepticism, and Celestial Order. Robert S. Westman (Berkeley and Los Angeles, 2011). Pp. xiv + 681. $95/£65. ISBN 978-0-520-25481-7.Robert Westman's book, whose harbinger dates back 1993, has finally arrived. In contrast other recent studies of the author of De revolutionibus, such as that by Anna De Pace presenting Copernicus as a Platonist or by Andre Goddu who roots Copernicus in the Aristotelian tradition, the present book embraces a much larger Copernican extending from the end of the fifteenth through the beginning of the seventeenth century (the 'long sixteenth century'). In fact, Westman's survey continues up Newton, which explains its bulk: 500 pages of text, nearly 100 pages of notes, 40 pages of bibliography and a very detailed index running more than 30 pages, with everything in two columns of small type. In a standard typography, the book would surely require more than 1000 pages. The work is imposing by its mass, by its synthesis of decades of published previously reflections. It is an ambitious work, not only for the number of texts considered but even more for the audacity of its thesis. In effect, Westman proposes a radically new approach his subject, which will surprise more than one specialist in studies.It is Westman's hypothesis concerning the trigger that launched Copernicus and the place occupied by astrology in his thought that I will especially consider in this review.Fully accepting the results of recent research on Copernicus - Westman summarizes the fundamental works by Noel Swerdlow and Bernard R. Goldstein on the way in which Copernicus technically conceived of a new celestial order leading heliocentrism - the author considers it necessary go further. If the earlier analyses provide a reasonable explanation of the 'how', they do not propose hypotheses for the 'why' of Copernicus's steps. According Westman, it is necessary understand the circumstances that made the question of the order of the inferior planets, considered as uncertain since Ptolemy, a view reiterated by Regiomontanus, appear urgent in the eyes of Copernicus. What caused him take seriously the 'law' of proportionality between the distances and periods of the planets, a question posed only in principle by his predecessors? What caused him take the Sun as the centre of all planetary motions, including the Earth, as had the Pythagoreans before him (p. 6 1 ) ? With what urgency would Copernicus have responded these questions?In 1989 the late Gerard Simon published an important book entitled Kepler astronome astrologue, arguing that for Kepler the two branches of the science of the stars were indivisible, each considered from the double view of theory and practice. Kepler, we might add, was the only who sought establish a truly heliocentric astrology.Is Westman now in turn proposing a Copernicus astronomer astrologer! This question seems at first paradoxical, for Copernicus, unlike Kepler, left no astrological writings and apparently never compiled a horoscope. This well-known silence on astrology, a discipline often considered intellectually reprehensible by earlier intellectual historians, is why the vast majority of Copernicus scholars have treated his heliocentrism as only an astronomical hypothesis and have at times vigorously denied that he could have fallen into the errors of a 'false science' like astrology.Westman, however, frames paradox differently, asking how historians could have examined Copernicus and the origins of his reflections on celestial science without: (1) recalling that Georg Joachim Rheticus, his first and only disciple, in 1540 presented the world the new cosmology illustrating its astrological fecundity by means of a prophesy (it can be assumed that Copernicus approved this publication); (2) considering Rheticus 's interest in astrology, which no one has ever denied, which is evidenced by his various writings in this area, even if his larger project remained unfinished; (3) noting that Copernicus, in passing through Bologna, lived four years with the astronomer-astrologer Domenico Maria Novara, not as a student but a collaborator with this recognized master of the science of the stars; and (4) emphasizing, finally, the remark by Rheticus that Giovanni Pico della Mirandola would have had no occasion criticize astronomy in his Disputationes adversus astrologiam divinatricem had he known of the work of Copernicus, viz, knowledge of the heliocentric order of the planets would have removed for Pico any opportunity to attack not only astrology but also astronomy. …
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