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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. Is 2024 a leap year? When is leap day, and why is it needed?

    www.aol.com/2024-leap-leap-day-why-204215160.html

    "By adding a leap day every four years, we actually make the calendar longer by over 44 minutes. Over time, these extra 44+ minutes would also cause the seasons to drift in our calendar. For this ...

  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. Sothic cycle - Wikipedia

    en.wikipedia.org/wiki/Sothic_cycle

    The Sothic cycle or Canicular period is a period of 1,461 Egyptian civil years of 365 days each or 1,460 Julian years averaging 365 + 1 ⁄ 4 days each. During a Sothic cycle, the 365-day year loses enough time that the start of its year once again coincides with the heliacal rising of the star Sirius ( Ancient Egyptian : spdt or Sopdet ...

  8. 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]

  9. 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 ...

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