Novi Calendarii Romani Apologia est liber Christophori Clavius, mathematici et astronomi Romani, qui anno 1588 editus est. In hoc libro Clavius defendit novum calendarii systema, quod anno 1582 Papa Gregorius XIII instituit. Hoc systema, quod nunc ""calendarii Gregoriani"" appellatur, emendavit errorem in antiquo calendario, quod causabat dissonantias inter solennitates ecclesiasticas et astronomicas. Clavius explicat rationem emendationis et defendit...
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