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2020-11-15 08:48:34
CLAVIUS, Christoph.
Romani Calendarii a Gregorio XIII. P.M. restituiti explicatio, Clementis VIII P.M. jussu edita. Accessit confutatio eorum, qui Calendario aliter instaurandum contenderunt.
Rome: Luigi Zanetti, 1603. First edition. THE FOUNDATION WORK ON THE GREGORIAN CALENDAR - RED MOROCCO BINDING FOR THE DEDICATEE POPE CLEMENT VIII. First edition, the dedication copy, in a magnificent contemporary red morocco binding by the Soresini workshop, of the most important work on the construction and accuracy of the Gregorian calendar. "Sometime between 1572 and 1575, Pope Gregory XIII convened a commission to make recommendations on the reform of the Julian calendar, and the young Clavius was tapped to serve as the commission's technical expert" (DSB). The result was the calendar in general use today, the Gregorian Civil Calendar, introduced by Pope Gregory XIII in 1582 in the bull 'Inter gravissimas,' and gradually adopted by most of the nations of the world in the course of the following centuries. It was actually devised by one Aloisius Lilius, a lecturer in medicine at the University of Perugia, and presented in summary form in a treatise entitled Compendium novae rationis restituendi Kalendarii (Rome, 1577), which also contained the plan adopted for the reform of the ecclesiastical calendar. The problem addressed by the commission was that the Julian calendar in use since Roman times had run out of step with the astronomical data in two ways. In its solar part, it had accumulated an error of ten days; the true average vernal equinox fell on March 11 rather than March 21 as the calendar assumed. This was corrected by omitting the ten calendar days October 5 through October 14, 1582. In its lunar part, the Julian calendar was wrong by three days; the true averag … [Cliquez ci-dessous pour une description complète]
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