John of Montfort (astronomer)

John of Montfort ()Laure Miolo, "Retracing the Tradition of John of Genoa's Opus astronomicum Through Extant Manuscripts", in Richard L. Kremer, Matthieu Husson and José Chabás, eds., Alfonsine Astronomy: The Written Record (Brepols, 2022), pp. 343–380, esp. 352–353. was an astronomer active in France in the early 14th century.Giancarlo Truffa (2014), "John of Montfort", in T. Hockey et al., eds., Biographical Encyclopedia of Astronomers (New York: Springer), pp. 1134–1135. He was probably a master at the University of Paris when he was recorded in the (collection record) from 1329–1330 as living "with five fellows" in a house on the Rue de la Bûcherie.William J. Courtenay, Parisian Scholars in the Early Fourteenth Century: A Social Portrait (Cambridge University Press, 1999), p. 224.

In January 1332, John completed a table of lunar velocity that was sometimes included with the Parisian revision of the Alfonsine tables. He computed lunar velocity in minutes of arc per minute (sixtieth) of a day according to Ptolemy's final model of lunar motion.José Chabás and Marie-Madeleine Saby, eds., The Tables of 1322 by John of Lignères: An Edition with Commentary (Brepols, 2022), p. 116.Bernard R. Goldstein, "Lunar Velocity in the Ptolemaic Tradition", in P. M. Harman and Alan E. Shapiro, eds., The Investigation of Difficult Things: Essays on Newton and the History of the Exact Sciences in Honour of D. T. Whiteside (Cambridge University Press, 1992), pp. 3–17. John's table can be found in the following manuscripts:

Paris, Bibliothèque nationale de France, Latin 7283 Oxford, Bodleian Library, Canon. Misc. 499, where it is anonymous

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