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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. The World Almanac - Wikipedia

    en.wikipedia.org/wiki/The_World_Almanac

    The World Almanac and Book of Facts, 1987, besides a tea kettle, TIPA, Dharamsala, India. In 1894, when it claimed more than a half-million "habitual users," The World Almanac changed its name to The World Almanac and Encyclopedia. This was the title it kept until 1923, when it became The World Almanac and Book of Facts, the name it bears today.

  4. List of almanacs - Wikipedia

    en.wikipedia.org/wiki/List_of_almanacs

    Old Farmer's Almanac (1792–present) Schott's Almanac; A Sound Word Almanac (2023) [3] TIME Almanac with Information Please, formerly Information Please Almanac (1947–2013) Wall Street Journal Almanac (1998 [4] and 1999 [5]) Whitaker's Almanack (1868–present) The World Almanac and Book of Facts (1868–1876, 1886–present) Almanaque Abril ...

  5. 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 ...

  6. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering . This is a visual example of the official date change from the Julian calendar to the Gregorian

  7. 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.

  8. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is the calendar used in most parts of the world. [ 1 ] [ a ] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII , which introduced it as a modification of, and replacement for, the Julian calendar .

  9. 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.