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REGIOMONTANUS (Johannes Müller) (1436-76), and others. Scripta clarissimi mathematici M. Joannis Regiomontani, de torqueto, astrolabio armillari, regula magna Ptolemaica, baculoq[ue] astronomico, et observationibus cometarum, aucta necessarijs, Joannis [Schöner] additionibus. Item. observationes motuum solis, ac stellarum tam fixarum, erraticarum. Item. Libellus M. Georgii Purbachii de quadrato geometrico. Joachimus Heller Leucopetræus ad Lectorem. Nuremberg: Johannes Montanus and Ulricum Neuber, 1544. Small 4to (19.5 x 15 cm). 41 woodcut diagrams and illustrations, including 3 full-page, initials, tables (some marginal spotting and staining, some leaves browned, lacks final errata leaf). Finely bound in modern crushed burgundy morocco [unsigned], spine lettered in git with 5 raised bands, modern marbled endpapers. Johannes Müller from Königsberg was a German mathematician, astronomer, astrologer, translator, instrument and is better known under the Latinized version of his name as Regiomontanus. His diligent and accurate observations, measurements and recordings paved the way for modern astronomers such as Tycho Brahe and Nikolaus Copernicus. In 1471 Regiomontanus went to Nuremberg at the invitation of Bernhard Walther, a rich citizen who provided him with the means to set up the first observatory in Europe. It was equipped with instruments of Regiomontanus's own making, which he described in Scripta de torqueto, astrolabio armillari, first printed in 1544. Other contributors listed on the title-page are Georg Peuerbach and Joachim Heller. The subject of the first two papers by Regiomontanus and Schöner is the Torquetum; an astronomical instrument designed to take and convert measurements made in three sets of coordinates: Horizon, equatorial, and ecliptic. Then follows Regiomontanus s paper on the armillary sphere, Schöner s on the large Ptolemaic rule, Regiomontaus s tables of solar observations, and Schöner s short piece on the astronomical radii. Peuerbach s Quadratum geometricum forms a significant part of the long final section on eclipses, comets and planetary observations by Regiomontanus and others.
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