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  2. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day ...

  3. Perennial calendar - Wikipedia

    en.wikipedia.org/wiki/Perennial_calendar

    A perennial calendar is a calendar that applies to any year, keeping the same dates, weekdays and other features. Perennial calendar systems differ from most widely used calendars which are annual calendars. Annual calendars include features particular to the year represented, and expire at the year's end. A perennial calendar differs also from ...

  4. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    His correlation argues that the first day of the Mexica year was February 13 of the old Julian calendar or February 23 of the current Gregorian calendar. Using the same count, it has been the date of the birth of Huitzilopochtli , the end of the year and a cycle or "Tie of the Years", and the New Fire Ceremony , day-sign 1 Tecpatl of the year 2 ...

  5. List of children's classic books - Wikipedia

    en.wikipedia.org/wiki/List_of_children's_classic...

    before 8th century AD. [ 7][ 8] Orbis Pictus. John Amos Comenius. 1658. Earliest picture book specifically for children. [ 9][ 10] A Token for Children. Being An Exact Account of the Conversion, Holy and Exemplary Lives, and Joyful Deaths of several Young Children. James Janeway.

  6. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    365-day calendar used for accounting. Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.

  7. Celtic calendar - Wikipedia

    en.wikipedia.org/wiki/Celtic_calendar

    The calendar uses a mathematical arrangement to keep a normal 12 month calendar in sync with the moon and keeps the whole system in sync by adding an intercalary month every 2 + 1 ⁄ 2 years. The Coligny calendar registers a five-year cycle of 62 lunar months , divided into a "bright" and a "dark" fortnight (or half a moon cycle) each.

  8. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    In modern China, a person's official age is based on the Gregorian calendar. For traditional use, age is based on the Chinese Sui calendar. A child is considered one year old at birth. After each Chinese New Year, one year is added to their traditional age. Their age therefore is the number of Chinese calendar years in which they have lived.

  9. Runic calendar - Wikipedia

    en.wikipedia.org/wiki/Runic_calendar

    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. Special days like solstices, equinoxes, and celebrations (including Christian holidays and feasts ...

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