Ptolemaeus Arabus et Latinus

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Work C.1.9

Johannes de Wasia
〈Annotationes in Almagesti〉

Notes and figures dealing mainly with the first two books of the Almagest and related material in great disorder. The notes open with Almagest II.12. The unique manuscript was copied by Johannes de Wasia (d. 1395) and the confused organisation of the material, as well as the corrections and marginal annotations in his hand, suggests that he was also the author. Johannes de Wasia [Waes, present-day Belgium] was active at the University of Paris at least from 1369 to 1383, then became parish priest at St Walburga in Bruges, canon at St Andrew of Cologne, and the first dean of the faculty of theology of the University of Cologne in 1394. The Annotationes in Almagesti were probably put together in Paris in or shortly after 1369. In the manuscript, these notes follow Henry of Langenstein’s Questio de cometa (f. 34r-47r), composed in Paris in 1368, and Johannes de Wasia’s own Tractatus de proportionibus (f. 48r-55r), which is an expanded version of his Compendium de proportionibus written in 1369 (Erfurt, UFB, Dep. Erf. CA 4º 325, s. XIV, f. 47r-51v). Johannes de Wasia is also the author of a table of mean motions of the planets for the meridian of Paris in 1369 (Erfurt, UFB, Dep. Erf. CA 4º 362, s. XIV, f. 13v-14r: ‘Tabella radicum mediorum motuum subscriptorum ad annum domini 1369 completa ad meridianum Parisiensem per Iohannem de Wasia calculata’) and of undated Questiones de spera (Erfurt, UFB, Dep. Erf. CA 4º 298, s. XIV, f. 31r-58r). For further Ptolemaic works possibly by Johannes de Wasia, see C.1.10, C.1.11.

Text ‘(Erfurt, UFB, Dep. Erf. CA 4º 349) Pro 12o 2e dictionis. Probatur in hac figura <quod> duo anguli — Dato quocumque puncto zodiaco angulum meridiani cum ecliptica invenire, si versus septentrionem.’

Bibl. The Annotationes in Almagesti do not appear to have been discussed in the literature. On Johannes de Wasia and his works, see K. De Cock, A. Pattin, ‘Joannes de Wasia († 1395), wijsgeer, theoloog en eerste deken van de theologische faculteit van de universiteit te Keulen’, Tijdschrift voor Filosofie 35 (1973), 345-351; A. Pattin, ‘Les Eléments d’Euclide source du De proportionibus de Jean de Waes († 1395)’, in Tradition et traduction. Les textes philosophiques et scientifiques grecs au Moyen Age latin. Hommage à Fernand Bossier, eds R. Beyers, J. Brams, D. Sacré, K. Verrycken, Leuven, 1999, 305-321; L. Cioca, ‘Johannes de Wasia and His Sentences Commentary’, Philobiblon. Transylvanian Journal of Multidisciplinary Research in Humanities 22 (2017), 149-164.

Modern ed. ---