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- Perpetual_calendar abstract "A perpetual calendar is a calendar valid for many years, usually designed to allow the calculation of the day of the week for a given date in the future.For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of two general variations: 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year. These one-year calendars divide evenly into two sets of seven calendars: seven for each common year (year that does not have a February 29) that starts on each day of the week, and seven for each leap year that starts on each day of the week, totaling fourteen. (See Dominical letter for one common naming scheme for the 14 calendars.) Seven (31-day) one-month calendars (or seven each of 28–31 day month lengths, for a total of 28) and one or more tables to show which calendar is used for any given month. Some perpetual calendars' tables slide against each other, so that aligning two scales with one another reveals the specific month calendar via a pointer or window mechanism.The seven calendars may be combined into one, either with 13 columns of which only seven are revealed, or with movable day-of-week names (as shown in the pocket perpetual calendar picture.Note that such a perpetual calendar fails to indicate the dates of moveable feasts such as Easter, which are calculated based on a combination of events in the Tropical year and lunar cycles. These issues are dealt with in great detail in Computus.An early example of a perpetual calendar for practical use is found in the manuscript GNM 3227a. The calendar covers the period of 1390–1495 (on which grounds the manuscript is dated to c. 1389). For each year of this period, it lists the number of weeks between Christmas day and Quinquagesima. This is the first known instance of a tabular form of perpetual calendar allowing the calculation of the moveable feasts which became popular during the 15th century.".
- Perpetual_calendar thumbnail Pat248872Fig1.jpg?width=300.
- Perpetual_calendar wikiPageExternalLink perpetual_calendar.
- Perpetual_calendar wikiPageExternalLink newperpetualcalendar.yolasite.com.
- Perpetual_calendar wikiPageID "569154".
- Perpetual_calendar wikiPageLength "12527".
- Perpetual_calendar wikiPageOutDegree "29".
- Perpetual_calendar wikiPageRevisionID "676845901".
- Perpetual_calendar wikiPageWikiLink Antikythera_Mechanism.
- Perpetual_calendar wikiPageWikiLink Antikythera_mechanism.
- Perpetual_calendar wikiPageWikiLink Buddhist_calendar.
- Perpetual_calendar wikiPageWikiLink Calendar.
- Perpetual_calendar wikiPageWikiLink Calendar_reform.
- Perpetual_calendar wikiPageWikiLink Category:Calendars.
- Perpetual_calendar wikiPageWikiLink Christmas.
- Perpetual_calendar wikiPageWikiLink Christmas_day.
- Perpetual_calendar wikiPageWikiLink Computus.
- Perpetual_calendar wikiPageWikiLink Day_of_the_week.
- Perpetual_calendar wikiPageWikiLink Determination_of_the_day_of_the_week.
- Perpetual_calendar wikiPageWikiLink Dominical_letter.
- Perpetual_calendar wikiPageWikiLink Doomsday_rule.
- Perpetual_calendar wikiPageWikiLink Easter.
- Perpetual_calendar wikiPageWikiLink File:Pat248872Fig1.jpg.
- Perpetual_calendar wikiPageWikiLink GNM_3227a.
- Perpetual_calendar wikiPageWikiLink Gregorian_calendar.
- Perpetual_calendar wikiPageWikiLink International_Fixed_Calendar.
- Perpetual_calendar wikiPageWikiLink Julian_calendar.
- Perpetual_calendar wikiPageWikiLink Long_Now_Foundation.
- Perpetual_calendar wikiPageWikiLink Moveable_feast.
- Perpetual_calendar wikiPageWikiLink Names_of_the_days_of_the_week.
- Perpetual_calendar wikiPageWikiLink Nürnberger_Handschrift_GNM_3227a.
- Perpetual_calendar wikiPageWikiLink Pax_Calendar.
- Perpetual_calendar wikiPageWikiLink Perennial_calendar.
- Perpetual_calendar wikiPageWikiLink Perpetual_Calendar_of_800_Years.
- Perpetual_calendar wikiPageWikiLink Quinquagesima.
- Perpetual_calendar wikiPageWikiLink The_World_Calendar.
- Perpetual_calendar wikiPageWikiLink Tropical_year.
- Perpetual_calendar wikiPageWikiLink World_Calendar.
- Perpetual_calendar wikiPageWikiLink Year_10,000_problem.
- Perpetual_calendar wikiPageWikiLink Zellers_congruence.
- Perpetual_calendar wikiPageWikiLink File:50yearcalendar.JPG.
- Perpetual_calendar wikiPageWikiLink File:Permanent_Calendar_gregorian.png.
- Perpetual_calendar wikiPageWikiLinkText "Perpetual calendar".
- Perpetual_calendar wikiPageWikiLinkText "calendar".
- Perpetual_calendar wikiPageWikiLinkText "perpetual calendar".
- Perpetual_calendar wikiPageWikiLinkText "perpetual".
- Perpetual_calendar hasPhotoCollection Perpetual_calendar.
- Perpetual_calendar wikiPageUsesTemplate Template:Calendars.
- Perpetual_calendar wikiPageUsesTemplate Template:Clear.
- Perpetual_calendar wikiPageUsesTemplate Template:Commons_category.
- Perpetual_calendar wikiPageUsesTemplate Template:List_of_calendars.
- Perpetual_calendar wikiPageUsesTemplate Template:Refimprove.
- Perpetual_calendar wikiPageUsesTemplate Template:Reflist.
- Perpetual_calendar subject Category:Calendars.
- Perpetual_calendar hypernym Calendar.
- Perpetual_calendar type Article.
- Perpetual_calendar type Convention.
- Perpetual_calendar type TelevisionShow.
- Perpetual_calendar type Article.
- Perpetual_calendar type Calendar.
- Perpetual_calendar type Convention.
- Perpetual_calendar comment "A perpetual calendar is a calendar valid for many years, usually designed to allow the calculation of the day of the week for a given date in the future.For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of two general variations: 14 one-year calendars, plus a table to show which one-year calendar is to be used for any given year.".
- Perpetual_calendar label "Perpetual calendar".
- Perpetual_calendar sameAs Целогодишни_календари.
- Perpetual_calendar sameAs Deiziadur_diarsav.
- Perpetual_calendar sameAs Calendari_perpetu.
- Perpetual_calendar sameAs Ewiger_Kalender.
- Perpetual_calendar sameAs Calendario_perpetuo.
- Perpetual_calendar sameAs Betiereko_egutegi.
- Perpetual_calendar sameAs Ikuinen_kalenteri.
- Perpetual_calendar sameAs Calendrier_perpétuel.
- Perpetual_calendar sameAs Calendario_perpetuo.
- Perpetual_calendar sameAs Kalendarz_wieczny.
- Perpetual_calendar sameAs Calendário_perpétuo.
- Perpetual_calendar sameAs m.02q__h.
- Perpetual_calendar sameAs Вечный_календарь.
- Perpetual_calendar sameAs Evighetskalender.
- Perpetual_calendar sameAs Вічний_календар.
- Perpetual_calendar sameAs Q1383171.
- Perpetual_calendar sameAs Q1383171.
- Perpetual_calendar sameAs 萬年曆.
- Perpetual_calendar wasDerivedFrom Perpetual_calendar?oldid=676845901.
- Perpetual_calendar depiction Pat248872Fig1.jpg.
- Perpetual_calendar isPrimaryTopicOf Perpetual_calendar.