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  2. Intercalation (timekeeping) - Wikipedia

    en.wikipedia.org/wiki/Intercalation_(timekeeping)

    The most common way to reconcile the two is to vary the number of days in the calendar year. In solar calendars, this is done by adding an extra day ("leap day" or "intercalary day") to a common year of 365 days, about once every four years, creating a leap year that has 366 days (Julian, Gregorian and Indian national calendars).

  3. 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.

  4. Intercalation - Wikipedia

    en.wikipedia.org/wiki/Intercalation

    Intercalation (timekeeping), insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons; Intercalation (university administration), period when a student is officially given time off from studying for an academic degree

  5. Why do we have Leap Year? A guide to the calendar's bonus day

    www.aol.com/why-leap-guide-calendars-bonus...

    Since the adoption of the intercalary day in 45 B.C., cultures around the world have created traditions to commemorate rare date. Most of them have to do with romance, which is fitting for the ...

  6. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    The term leap year probably comes from the fact that a fixed date in the Gregorian calendar normally advances one day of the week from one year to the next, but the day of the week in the 12 months following the leap day (from 1 March through 28 February of the following year) will advance two days due to the extra day, thus leaping over one ...

  7. Intercalary month (Egypt) - Wikipedia

    en.wikipedia.org/wiki/Intercalary_month_(Egypt)

    In all but a handful of texts, however, the days are merely numbered as "Day ~ of the Five Days upon the Year". [ 32 ] Ptolemy III 's Canopus Decree was an attempted calendrical reform in 239 BC which would have inserted a sixth day into the intercalary month, but it was abandoned due to the hostility of the priests [ 33 ] and people of Egypt.

  8. Baháʼí calendar - Wikipedia

    en.wikipedia.org/wiki/Baháʼí_calendar

    It used a scheme of nineteen months of nineteen days, with the product of 361 days, plus intercalary days to make the calendar a solar calendar. The first day of the early implementation of the calendar year was Nowruz , [ 4 ] while the intercalary days were assigned differently than the later Baháʼí implementation.

  9. Lunisolar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunisolar_calendar

    A tropical year is approximately 365.2422 days long and a synodic month is approximately 29.5306 days long, [4] so a tropical year is approximately 365.2422 / 29.5306 ≈ 12.36826 months long. Because 0.36826 is between 1 ⁄ 3 and 1 ⁄ 2 , a typical year of 12 months needs to be supplemented with one intercalary or leap month every 2 to 3 years.