page_title: Adoption of the Gregorian calendar
hierarchical_section_title: Adoption of the Gregorian calendar
caption_attribution_description: Español: El LUNARIO. El "Lunario" del Vaticano y la información acerca de la reforma del Calendario Juliano por orden del Papa Gregorio XIII. Del "Lunario" de Octubre, Noviembre y Diciembre del año 1582. Notar como "salta" del 4 de Octubre al 15 de Octubre, y esto para "acomodar" nuevamente el 21 de Marzo con el Equinoccio correspondiente. Presentado a las autoridades vaticanas por Antonio Lilio, hermano de Luigi Lilio (el que hizo los cálculos) e Impreso por Vincentio Accolti. Ver transcripción del texto de la bula papal Ver cálculo del año bisiesto y reforma gragoriana Ver Correspondencia del Calendario Gregoriano con el Juliano.
context_page_description: The adoption of the Gregorian Calendar was an event in the modern history of most cultures and societies, marking a change from their traditional dating system to the modern dating system that is widely used around the world today. Some states adopted the new calendar from 1582, some did not do so before the early twentieth century, and others did so at various dates between; however a number continue to use a different civil calendar. For many the new style calendar is only used for civil purposes and the old style calendar remains used in religious contexts. Today, the Gregorian calendar is the world's most widely used civil calendar. During – and for some time after – the change between systems, it has been common to use the terms Old Style and New Style when giving dates, to indicate which calendar was used to reckon them.
  The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct the erroneous assumption in the then-current Julian calendar that a year lasts 365.25 days, when in reality it is about 365.2422 days.
context_section_description: The adoption of the Gregorian Calendar was an event in the modern history of most cultures and societies, marking a change from their traditional (or old style) dating system to the modern (or new style) dating system that is widely used around the world today. Some states adopted the new calendar from 1582, some did not do so before the early twentieth century, and others did so at various dates between; however a number continue to use a different civil calendar. For many the new style calendar is only used for civil purposes and the old style calendar remains used in religious contexts. Today, the Gregorian calendar is the world's most widely used civil calendar. During –  and for some time after –  the change between systems, it has been common to use the terms Old Style and New Style when giving dates, to indicate which calendar was used to reckon them.
  The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct the erroneous assumption in the then-current Julian calendar that a year lasts 365.25 days, when in reality it is about 365.2422 days. Although Gregory's reform was enacted in the most solemn of forms available to the Church, the bull had no authority beyond the Catholic Church and the Papal States. The changes he was proposing were changes to the civil calendar, over which he had no formal authority. They required adoption by the civil authorities in each country to have legal effect.
  The bull became the canon law of the Catholic Church in 1582, but it was not recognised by Protestant churches, Eastern Orthodox Churches, and a few others. Consequently, the days on which Easter and related holidays were celebrated by different Christian churches diverged.
caption: Lunario Novo, Secondo la Nuova Riforma della Correttione del l'Anno Riformato da N.S. Gregorio XIII, printed in Rome by Vincenzo Accolti in 1582, one of the first printed editions of the new calendar.
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