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  2. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.

  3. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [ 1 ] [ 2 ] drawing inspiration from Lewis Carroll 's perpetual calendar algorithm .

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  5. Talk:Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Talk:Perpetual_calendar

    Those look-up tables, like the table in section “Perpetual Julian and Gregorian calendar table” of “Perpetual calendar” wiki item or in the first subsection of “Tabular methods to calculate the day of the week” section of “Determination of the day of the week” wiki item, are a condensation in a single table of the concept tables ...

  6. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    Catalan early 20th century perpetual calendar. Nearly all calendar systems group consecutive days into "months" and also into "years". In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities.

  7. Runic calendar - Wikipedia

    en.wikipedia.org/wiki/Runic_calendar

    Runic calendar from the Estonian island of Saaremaa with each month on a separate wooden board. A Runic calendar (also Rune staff or Runic almanac) is a perpetual calendar, variants of which were used in Northern Europe until the 19th century. A typical runic calendar consisted of several horizontal lines of symbols, one above the other.

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