Rome, Zannettum, 1603.
Un volume in-16 (154x87 mm), 107-(20)-(1bl.) pages. reliure : Plein vélin ancien. Un accroc au dos.
références: The Erwin Tomash Library on the History of Computing [ C97 (this copy) : "Computus ecclesiasticus was not directed to the subject of calendar reform but to the calculation of the dates of the Christian festivals, chiefly Easter. As implied by the title, Clavius explains two ways of performing the calculations, one using the fingers and another by means of the extensive set of tables included in the work. The text contains no diagrams of the finger methods.".
provenance: Erwin Tomash (étiquette au contreplat), l'une des plus importante bibliothèque sur l'histoire de l'informatique.
Prix : 1200 €