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  2. Armelin's calendar - Wikipedia

    en.wikipedia.org/wiki/Armelin's_calendar

    The 366th day of leap year is likewise an extra day, bearing an appropriate descriptive name, perhaps "Leap Day", but no week-day name, nor is it a part of any month. It is the day following December 31, and the day preceding New Year's Day. It is assumed to be a holiday — it occurs once every four years. It could follow June 31, if preferred.

  3. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle (July), saying the months while doing so. One then returns to the little finger knuckle (now August) and continues for the ...

  4. Thirty Days Hath September - Wikipedia

    en.wikipedia.org/wiki/Thirty_days_hath_September

    Thirty Days Hath September", or "Thirty Days Has September", [1] is a traditional verse mnemonic used to remember the number of days in the months of the Julian and Gregorian calendars. It arose as an oral tradition and exists in many variants. It is currently earliest attested in English, but was and remains common throughout Europe as well. Full:

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    August (31 days), from Latin mēnsis Augustus, "Month of Augustus", instituted by Augustus in 8 BC in agreement with July and from the occurrence during the month of several important events during his rise to power [68] September (30 days), from Latin mēnsis september, "seventh month", of the ten-month Roman year of Romulus c. 750 BC [69]

  6. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The original Roman calendar is usually believed to have been an observational lunar calendar [2] whose months ended and began from the new moon. [3] [4] Because a lunar cycle is about 29.5 days long, such months would have varied between 29 and 30 days. [5]

  7. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    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 ...

  8. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    According to Appendix D of The Lord of the Rings, this calendar has arranged the year in 12 months of 30 days each. The month the Hobbits call Solmath is rendered in the text as February, and therefore the date February 30 exists in the narrative. [21] February 30, 1951, is the last night of the world in Ray Bradbury's short story "Last Night ...

  9. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The quarters are equal: each has exactly 91 days, 13 weeks, or 3 months. The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October. The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar.