GNOMONICS

GNOMONICS
-Clavius
, Christoph.

Fabrica et usus instrumenti ad horologiorum descriptionem peropportuni. Repeat full page with 4. Woodcuts, 2 woodcut vignettes, 55 (24 full-page) geometrical and astronomical figures and some

tables.

Rome, J. Ruffinelli for B. Grassi, 1586. Kl.-4°. Bulletin, 151 p. Parchment ribbon d. Z. (spotted, clasps removed) with modern

back cover.
Edit16 CNCE 12677 - Adams C 2097 - Houzeau/ L. 11385 - Tomash/ W. C 99 - DeBacker/ S. II, 1216 - not at Zinner. - First edition. - Rare and early work by Christoph Clavius (1538-1612) on sundials, in which the "Euclid of his age" presents his astronomical research on the position of the sun and the resulting measurement of time and calendar calculation, as well as giving instructions on the construction of sundials. "He entered the Jesuit order, studied in Coimbra (where he observed an eclipse in 1596, where, according to him, the darkness was so great that he could not see his steps), was a teacher of mathematics at the college of his order in Rome for 14 years, was highly respected for his erudition and rose to Cardinal. He was... appointed by Pope Gregory XIII to improve the calendar... and (has) had a bitter dispute with Scaliger, Calvisius and Maestlin about the improvement" (ADB IV, 298). - Dedication sheet and table of contents included after p. 4. - Resolutions renewed, title with deleted hs. Notice the ownership and some insect caused damage in the upper margin. - Good specimen.
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