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- Gregorian_calendar abstract "The Gregorian calendar, also called the Western calendar and the Christian calendar, is internationally the most widely used civil calendar. It has been the unofficial global standard for decades, recognised by international institutions such as the United Nations and the Universal Postal Union.The calendar was a refinement in 1582 to the Julian calendar amounting to a 0.002% correction in the length of the year. The motivation for the reform was to bring the date for the celebration of Easter to the time of the year in which the First Council of Nicaea had agreed upon in 325. Because the celebration of Easter was tied to the spring equinox, the Roman Catholic Church considered this steady drift in the date of Easter undesirable. The reform was adopted initially by the Catholic countries of Europe. Protestants and Eastern Orthodox countries continued to use the traditional Julian calendar and adopted the Gregorian reform after a time, for the sake of convenience in international trade. The last European country to adopt the reform was Greece, in 1923.The Gregorian reform contained two parts: a reform of the Julian calendar as used prior to Pope Gregory XIII's time and a reform of the lunar cycle used by the Church, with the Julian calendar, to calculate the date of Easter. The reform was a modification of a proposal made by Aloysius Lilius. His proposal included reducing the number of leap years in four centuries from 100 to 97, by making 3 out of 4 centurial years common instead of leap years. Lilius also produced an original and practical scheme for adjusting the epacts of the moon when calculating the annual date of Easter, solving a long-standing obstacle to calendar reform.The Gregorian reform modified the Julian calendar's scheme of leap years as follows:Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the year 2000 is.In addition to the change in the mean length of the calendar year from 365.25 days (365 days 6 hours) to 365.2425 days (365 days 5 hours 49 minutes 12 seconds), a reduction of 10 minutes 48 seconds per year, the Gregorian calendar reform also dealt with the accumulated difference between these lengths. Between AD 325 (when the First Council of Nicaea was held, and the vernal equinox occurred approximately 21 March), and the time of Pope Gregory's bull in 1582, the vernal equinox had moved backward in the calendar, so that in 1582 it occurred about 11 March, 10 days earlier than 21 March. The Gregorian calendar therefore began by skipping 10 calendar days, to restore 21 March as the date of the vernal equinox.Though not part of the Gregorian calendar itself, the reformed calendar continued the previous year-numbering system (Anno Domini), which counts years from the traditional date of the nativity, originally calculated in the 6th century and in use in much of Europe by the High Middle Ages. This year-numbering system, now also called the Common Era, is the predominant international standard today.".
- Gregorian_calendar wikiPageExternalLink 1992JBAA..102...40M.
- Gregorian_calendar wikiPageExternalLink 2004JHA....35..327M.
- Gregorian_calendar wikiPageExternalLink nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=181.
- Gregorian_calendar wikiPageExternalLink nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=209.
- Gregorian_calendar wikiPageExternalLink nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=34.
- Gregorian_calendar wikiPageExternalLink 0000001,001.html.
- Gregorian_calendar wikiPageExternalLink books?id=KawSAAAAYAAJ&pg=PA348.
- Gregorian_calendar wikiPageExternalLink books?id=rhUm97beo2cC.
- Gregorian_calendar wikiPageExternalLink 8601RevN005_Inter_Gravissimas.pdf?nodeid=2179035&vernum=0.
- Gregorian_calendar wikiPageExternalLink 0200307180.
- Gregorian_calendar wikiPageExternalLink year-history.html.
- Gregorian_calendar wikiPageExternalLink NewInterGravissimas.htm.
- Gregorian_calendar wikiPageExternalLink todays-date.asp.
- Gregorian_calendar wikiPageExternalLink www.etymonline.com.
- Gregorian_calendar wikiPageExternalLink calendar.
- Gregorian_calendar wikiPageExternalLink calendar.php.
- Gregorian_calendar wikiPageExternalLink dates.html.
- Gregorian_calendar wikiPageExternalLink calendar.html.
- Gregorian_calendar wikiPageExternalLink home!readform.
- Gregorian_calendar wikiPageID "23306251".
- Gregorian_calendar wikiPageRevisionID "606579116".
- Gregorian_calendar hasPhotoCollection Gregorian_calendar.
- Gregorian_calendar subject Category:1582_establishments.
- Gregorian_calendar subject Category:Articles_which_contain_graphical_timelines.
- Gregorian_calendar subject Category:Gregorian_calendar.
- Gregorian_calendar type Country.
- Gregorian_calendar type Place.
- Gregorian_calendar type PopulatedPlace.
- Gregorian_calendar type Wikidata:Q532.
- Gregorian_calendar type Country.
- Gregorian_calendar type Place.
- Gregorian_calendar type Location.
- Gregorian_calendar comment "The Gregorian calendar, also called the Western calendar and the Christian calendar, is internationally the most widely used civil calendar. It has been the unofficial global standard for decades, recognised by international institutions such as the United Nations and the Universal Postal Union.The calendar was a refinement in 1582 to the Julian calendar amounting to a 0.002% correction in the length of the year.".
- Gregorian_calendar label "Calendario gregoriano".
- Gregorian_calendar label "Calendario gregoriano".
- Gregorian_calendar label "Calendrier grégorien".
- Gregorian_calendar label "Calendário gregoriano".
- Gregorian_calendar label "Gregoriaanse kalender".
- Gregorian_calendar label "Gregorian calendar".
- Gregorian_calendar label "Gregorianischer Kalender".
- Gregorian_calendar label "Kalendarz gregoriański".
- Gregorian_calendar label "Григорианский календарь".
- Gregorian_calendar label "تقويم ميلادي".
- Gregorian_calendar label "グレゴリオ暦".
- Gregorian_calendar label "公历".
- Gregorian_calendar sameAs Gregoriánský_kalendář.
- Gregorian_calendar sameAs Gregorianischer_Kalender.
- Gregorian_calendar sameAs Γρηγοριανό_ημερολόγιο.
- Gregorian_calendar sameAs Calendario_gregoriano.
- Gregorian_calendar sameAs Gregoriotar_egutegia.
- Gregorian_calendar sameAs Calendrier_grégorien.
- Gregorian_calendar sameAs Kalender_Gregorius.
- Gregorian_calendar sameAs Calendario_gregoriano.
- Gregorian_calendar sameAs グレゴリオ暦.
- Gregorian_calendar sameAs 그레고리력.
- Gregorian_calendar sameAs Gregoriaanse_kalender.
- Gregorian_calendar sameAs Kalendarz_gregoriański.
- Gregorian_calendar sameAs Calendário_gregoriano.
- Gregorian_calendar sameAs m.037d3.
- Gregorian_calendar sameAs Mx4rvVkIX5wpEbGdrcN5Y29ycA.
- Gregorian_calendar sameAs Q12138.
- Gregorian_calendar sameAs Q12138.
- Gregorian_calendar wasDerivedFrom Gregorian_calendar?oldid=606579116.
- Gregorian_calendar isPrimaryTopicOf Gregorian_calendar.