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Ayyám-i-Há is a period of intercalary days in the Baháʼí calendar, when Baháʼís celebrate the Festival of Ayyám-i-Há. [2] The four or five days of this period are inserted between the last two months of the calendar (Mulk and ʻAláʼ). [3]
The number of the intercalary days is determined in advance to ensure that the year ends on the day before the next vernal equinox. This results in 4 or 5 intercalary days being added. These days are inserted between the 18th and 19th months, falling around the end of February in the Gregorian calendar.
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).
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 ...
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
days copied to the intercalary months. The notations on the days of the intercalary months are created by a complex series of copies and merges of notations from certain days in the normal lunar months. Each day of an intercalary month sequentially copies a lunar month and the same day number, with its source month name added.
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.
There is another version where, in addition, the fourth leap day is postponed to year 11 and the last leap day is in the last year of the 30-year cycle. The mean number of days per month in the 30-year cycle is 29.53056 days, or 29d 12h 44m. Six months of 29 days and six with 30 days, plus 11 days of the leap years.