Cal­en­dar Com­pli­Ca­tions at a glanCe

DA MAN - Caliber - - LEGACY -

Cal­en­dar com­pli­ca­tions in gen­eral are fea­tures on a watch dial that tell the date, month, year and might even ac­count for leap years—which have an ad­di­tional day, Fe­bru­ary 29, ev­ery four years. The first two are, quite frankly, quite com­mon th­ese days, since most watch brands have de­vel­oped their own style of dis­play­ing dates and months. Cal­cu­lat­ing leap years, how­ever, re­quire an in­tri­cate mech­a­nism, one that is able to count the pass­ing of the years, and add one more day af­ter three years in a row.

A cal­en­dar com­pli­ca­tion that in­cludes all those four cal­en­dar fea­tures is called a per­pet­ual cal­en­dar or, al­ter­nately, at least in Switzer­land, a quan­tième per­pétuel. The first watch­maker to of­fer that highly com­plex mech­a­nism in­side a wrist­watch was none other than Patek Philippe, the last fam­ily-owned in­de­pen­dent Genevan watch man­u­fac­turer. It was, to be pre­cise, back in 1925 when the leg­endary house de­buted the No. 97975 per­pet­ual cal­en­dar time­piece. It not only ac­cu­rately showed the date of dif­fer­ent months (ac­cu­rately mov­ing be­tween 30 and 31 days) but also au­to­mat­i­cally rec­og­nized leap years. Only one-time ad­just­ment once ev­ery cen­tury was needed, be­cause leap years, ac­cord­ing to the Gre­go­rian cal­en­dar, are

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