WELSCH, Georg Hieronymus (1624-1677). Commentarius in Ruzname Naurus. Augsburg: Gottlieb Göbel for Johann Schönig, 1676.
WELSCH, Georg Hieronymus (1624-1677). Commentarius in Ruzname Naurus. Augsburg: Gottlieb Göbel for Johann Schönig, 1676.
WELSCH, Georg Hieronymus (1624-1677). Commentarius in Ruzname Naurus. Augsburg: Gottlieb Göbel for Johann Schönig, 1676.
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WELSCH, Georg Hieronymus (1624-1677). Commentarius in Ruzname Naurus. Augsburg: Gottlieb Göbel for Johann Schönig, 1676.

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WELSCH, Georg Hieronymus (1624-1677). Commentarius in Ruzname Naurus. Augsburg: Gottlieb Göbel for Johann Schönig, 1676.

4º (185 x 143mm). Engraved frontispiece by G. Waldreith after H. Schoenfeld, 22 etched plates by M. Haffner. (Occasional light browning, H4r slightly soiled.) Modern brown half morocco, spine lettered longitudinally in gilt.

FIRST EDITION of this Western work on a manuscript of the Ruzname Naurus, the Persian perpetual calendar, attributed today to the 9th-century Persian mathematician Abu'l-Wafâ Al-Buzjâni (see DSB I, p.39). The fact that the commentary on the calendar is in Turkish may be the cause of the common misattribution to a Turkish sheikh of similar name. Having studied the sciences in Italy between 1645 and 1648, Georg Hieronymus Welsch, a German physician and scholar, returned to Augsburg to devote himself to the study of oriental science. Using a manuscript Persian perpetual calendar acquired from Christoph Weikmann's Kunstkammer in Ulm, he drew up this study in Latin, Ottoman Turkish and a whole range of languages, the text providing an introduction to Turkish astronomy, as well as a painstaking study of the manuscript itself. The book’s illustrations are particularly successful. The frontispiece represents two Ottoman astronomers, the first six plates illustrate globes, astrolabes, and alphabets, while the other 16 reproduce the manuscript, placing the text within an exotic floral frame. Houzeau and Lancaster 1595.

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