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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 wikiPageRevisionID "599074265".
- Perpetual_calendar hasPhotoCollection Perpetual_calendar.
- Perpetual_calendar subject Category:Calendars.
- 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 "Calendario perpetuo".
- Perpetual_calendar label "Calendario perpetuo".
- Perpetual_calendar label "Calendrier perpétuel".
- Perpetual_calendar label "Calendário perpétuo".
- Perpetual_calendar label "Ewiger Kalender".
- Perpetual_calendar label "Kalendarz wieczny".
- Perpetual_calendar label "Perpetual calendar".
- Perpetual_calendar label "Вечный календарь".
- Perpetual_calendar sameAs Ewiger_Kalender.
- Perpetual_calendar sameAs Calendario_perpetuo.
- Perpetual_calendar sameAs Betiereko_egutegi.
- 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 Q1383171.
- Perpetual_calendar sameAs Q1383171.
- Perpetual_calendar wasDerivedFrom Perpetual_calendar?oldid=599074265.
- Perpetual_calendar depiction Pat248872Fig1.jpg.
- Perpetual_calendar isPrimaryTopicOf Perpetual_calendar.