Scattered notes and calculations concerning various parts of Books I-III of the Almagest, introduced by a preface. These notes and calculations are found in a unique manuscript in Regiomontanus’s hand, except for a portion copied by Cardinal Bessarion. Zinner dates these notes to c. 1463 and speculates that they may have served as a preliminary to the Problemata Almagesti, a work to which Regiomontanus refers several times in his works and letters, but which appears to be lost.

Text ‘(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…’.

Bibl. E. Zinner, ‘Einige Handschriften des Johann Regiomontan (aus Königsberg in Franken)’, Historischer Verein, Bamberg, Berichte 100 (1964), 315-323: 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 Königsberg, 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; M. Malpangotto, Regiomontano e il rinnovamento del sapere matematico e astronomico nel Quattrocento, Bari, 2008, 206; F. Acerbi, ‘I codici matematici di Bessarione’, in I libri di Bessarione. Studi sui manoscritti del Cardinale a Venezia e in Europa, eds. A. Rigo, N. Zorzi, Turnhout, 2021, 107-218: 115 n. 25.

Modern ed. ---