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Silver perpetual calendar CALENDARIUM PERPETUUM, perpetual_calendar calendar information form silver h 0,2, rolled engraved Round consisting of three flat discs with screw mounted on each other of which the middle is stuck and slightly larger than the other two; in the discs that can slide, boxes are left under which the engraving of the central disk is visible; at the front six saved pens for constellation day length month plus number of days night hours hour sunset hour sunrise; at the back carved box for the days of the month, engraved in Roman capital: CALENDARIUM PERPETUUM on the outer edge in italics: Dagh - langh; Maent - Days; night - langh; ondergangh - Son - opgangh Stadscentrum Stadsdriehoek Rotterdam cityscape Maas Laurenskerk topography measuring time. (Photo by: Sepia Times/Universal Images Group via Getty Images)