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  2. Ayyám-i-Há - Wikipedia

    en.wikipedia.org/wiki/Ayyám-i-Há

    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]

  3. 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).

  4. 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.

  5. 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 ...

  6. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    Every one of these calendars has a year of 365 days, which is occasionally extended by adding an extra day to form a leap year, a method called "intercalation", the inserted day being "intercalary". The Baháʼí calendar , another example of a solar calendar, always begins the year on the vernal equinox and sets its intercalary days so that ...

  7. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    This intercalary month was formed by inserting 22 or 23 days after the first 23 days of February; the last five days of February, which counted down toward the start of March, became the last five days of Intercalaris. The net effect was to add 22 or 23 days to the year, forming an intercalary year of 377 or 378 days. [5]

  8. Mandaean calendar - Wikipedia

    en.wikipedia.org/wiki/Mandaean_calendar

    It consists of twelve 30-day months, with five extra days at the end of Šumbulta (the 8th month). The Parwanaya (or Panja) festival takes place during those five days. [ 2 ] There is no leap year therefore every four years all Mandaean dates (like beginnings of the months or festivals) move one day back with respect to the Gregorian calendar .

  9. Coligny calendar - Wikipedia

    en.wikipedia.org/wiki/Coligny_calendar

    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.