A Science of Time: Roger Bacon and His Successors
CHAPTER SIX A SCIENCE OF TIME: ROGER BACON AND HIS SUCCESSORS 1. Bacon, the Calendar, and the Passion of Christ The acute criticism of the ecclesiastical calendar voiced in theCompotus emendatus of Reinher of Paderborn and—in somewhat more subdued form—in the works of Constabularius and Roger of Hereford fell on fertile ground in the following century, during which three well-known English scholars went on to pen influential treatises on the reform of the calendar, which took account of the deficiencies both of the Julian calendar with respect to the sun and the 19-year lunisolar cycle with respect to the moon. The three men in question were the astronomer John of Sacrobosco (ca. 1195–ca. 1256), who wrote a treatise De anni ratione (ca. 1232/35),1 Robert Grosseteste (ca. 1170–1253), chancellor of Oxford University and bishop of Hereford, who wrote a Compo- tus correctorius (ca. 1220/30), and—most importantly—the Franciscan polymath Roger Bacon (ca. 1214/20–ca. 1292).2 Bacon’s views on the calendar have gained particular fame for the strident tone in which they were expressed and for the fact that he was the first to present this kind of criticism to the only person in Latin Christendom who could have possibly authorized the desired change: Pope Clement IV (1265–68), to whom he addressed both his Opus 1 Theeditio princeps of this text can be found in John of Sacrobosco, Libellus de Sphaera, ed. Philipp Melanchthon (Wittenberg, 1538), Br–H3r. On the background, see Olaf Pedersen, “In Quest of Sacrobosco,” Journal for the History of Astronomy 16 (1985): 175–221; Jennifer Moreton, “John of Sacrobosco and the Calendar,” Viator 25 (1994): 229–44.
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