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  2. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Thus, to minimise uncertainty, there have been attempts to create fixed arithmetical rules to determine the start of each calendar month. The best known of these is the Tabular Islamic calendar: in brief, it has a 30-year cycle with 11 leap years of 355 days and 19 years of 354 days. In the long term, it is accurate to one day in about 2,500 ...

  3. 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 ...

  4. Thirty Days Hath September - Wikipedia

    en.wikipedia.org/wiki/Thirty_days_hath_September

    The months of Rome's original lunar calendar would have varied between 29 and 30 days, depending on observations of the phases of the moon. [2] Reforms credited to Romulus and Numa established a set year of twelve fixed months.

  5. December 30 - Wikipedia

    en.wikipedia.org/wiki/December_30

    December 30 is the 364th day of the year (365th in leap years) in the Gregorian calendar; one day remains until the end of the year. Events. Pre-1600. 534 ...

  6. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    The following is a list of notable month-long observances, recurrent months that are used by various governments, groups and organizations to raise awareness of an issue, commemorate a group or event, or celebrate something.

  7. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

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  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.