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Ptolemaeus Arabus et Latinus

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Work C.1.22

Notes and Calculations about the Almagest


‘(Venice, BNM, Fondo antico gr. Z. 526) Vulgatum est apud geometricas quantitatem anguli plani et rectilinei dependere…  (208r) Ad quintum capitulum libri III. Ponatur arcus eccentrici…’.


Scattered notes and calculations on various parts of Books I-III of the Almagest, introduced by a preface.


These notes and calculations are found in a unique MS and are in Regiomontanus’s hand (except for a portion copied by Bessarion, f. 208r-210v). Zinner dates these notes to c. 1463 and speculates that they may have served as preliminary notes to the Problemata Almagesti, a work to which Regiomontanus refers several times in his works and letters, but which appears to be lost.


E. Zinner, ‘Einige Handschriften des Johann Regiomontan (aus Königsberg in Franken)’, Historischer Verein, Bamberg, Berichte 100 (1964), 322-323; E. Zinner, Regiomontanus: His Life and Work, Amsterdam-New York-Oxford-Tokyo, 1990 (tr. with additions of Leben und Wirken des Joh. Müller von Köningsberg, genannt Regiomontanus, Osnabrück, 1968), 74-76; A. Rigo, ‘Bessarione, Giovanni, Regiomontano e i loro studi su Tolomeo a Venezia e Roma (1462-1464)’, Studi Veneziani, N. S. 21 (1991), 49-110: 92-95; A. Rigo, ‘Gli interessi astronomici del cardinal Bessarione’, in Bessarione e l’Umanesimo. Catalogo della mostra, eds G. Fiaccadori, A. Cuna, A. Gatti, S. Ricci, Napoli, 1994, 105-117: 112.