Johannes de Wasia
Notes on the Almagest
Text ‘(Erfurt, UFB, Amplon. Q. 349) Pro 12o 2e dictionis. Probatur in hac figura <quod> duo anguli — Dato quocumque puncto zodiaco angulum meridiani cum ecliptica invenire, si versus septentrionem.’
Content 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.
Origin The only known witness was copied by Johannes de Wasia and the confused organisation of the material 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 and canon at St Andrew of Cologne, and was elected in 1394 first dean of the faculty of Theology of the University of Cologne. He died in Cologne in 1395. The notes on the Almagest were probably put together in Paris in or shortly after 1369. In the MS, these notes follow Henry of Langenstein’s Questio de cometa (f. 34r-47r), composed in Paris in 1368, and Johannes de Wasia’s Tractatus de proportionibus (f. 48r-55r), which is an expanded version of his own Compendium de proportionibus written in 1369 (Erfurt, UFB, Amplon. Q. 395, s. XIV, f. 47r-51v). Johannes de Wasia also appears to be the author of a table of mean motions of the planets computed for the meridian of Paris in 1369 (Erfurt, UFB, Amplon. Q. 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, Amplon. Q. 298, s. XIV, f. 31r-58r). On Johannes de Wasia and his works, see K. De Cock, A. Pattin, ‘Johannes de Wasia († 1395); wijsgeer; theoloog en eerste deken van de theologische faculteit 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.