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Estimate: $ 800 - $ 1,200
CLAVIUS, CHRISTOPHER, S.J. Novi calendarii Romani apologia, adversus Michaelem Maestlinum Goeppingensem, in Academia Tubingensi Mathematicum. [74] (of [80]), 398, [2] pages; lacks the 3 leaves after the title (dedication to Holy Roman Emperor Rudolf II) and the last leaf, blank except for printer's device on verso. 4to, 211x152 mm, 17th-century calf gilt with later leather lettering piece, top of spine chipped; occasional soiling, foxing, and dampstaining, title torn and mounted with substantial portion of text supplied in pen-and-ink facsimile, upper outer corner of b1 excised and restored with text similarly replaced. apud Sanctium & Soc., 1588
first edition of a response to the astronomer Michael Mästlin's criticisms of the Gregorian calendar. The foremost early figure in Jesuit science, Clavius (1538-1612) was one of the chief architects and defenders of the 1582 calendar reform under Pope Gregory XIII. BEA, pages 238-39.
