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  2. Intercalation (timekeeping) - Wikipedia

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

    Whether to insert an intercalary month in a given year may be determined using regular cycles such as the 19-year Metonic cycle (Hebrew calendar and in the determination of Easter) or using calculations of lunar phases (Hindu lunisolar and Chinese calendars). The Buddhist calendar adds both an intercalary day and month on a usually regular cycle.

  3. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]

  4. 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]

  5. Ancient Greek calendars - Wikipedia

    en.wikipedia.org/wiki/Ancient_Greek_calendars

    Various ancient Greek calendars began in most states of ancient Greece between autumn and winter except for the Attic calendar, which began in summer.. The Greeks, as early as the time of Homer, appear to have been familiar with the division of the year into the twelve lunar months but no intercalary month Embolimos or day is then mentioned, with twelve months of 354 days. [1]

  6. What’s the point of a Leap Year? Why 2024 brings 29 days of ...

    www.aol.com/point-leap-why-2024-brings-192452163...

    The event normally occurs once every four years, and many people aren’t aware of what exactly the extra day does aside from making the year longer. Here’s everything you need to know about ...

  7. Intercalary month (Egypt) - Wikipedia

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

    Parker also proposed that in some cases the intercalary month was known by the name Thoth (Ḏḥwtyt) after the festival that gave its name to the following month. [ 10 ] In modern Egypt, the period is known as Kouji Nabot [ 5 ] or Pi Kogi Enavot [ 11 ] ( Coptic : Ⲡⲓⲕⲟⲩϫⲓ ⲛ̀ⲁⲃⲟⲧ , Pikouji n'Abot , lit .

  8. February 29 - Wikipedia

    en.wikipedia.org/wiki/February_29

    February 29 is a leap day (or "leap year day")—an intercalary date added periodically to create leap years in the Julian and Gregorian calendars.It is the 60th day of a leap year in both Julian and Gregorian calendars, and 306 days remain until the end of the leap year.

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The intercalary month counted down to nones and ides on its 5th and 13th day in the manner of the other short months. The remaining days of the month counted down towards the March Kalends, so that the end of Mercedonius and the second part of February were indistinguishable to the Romans, one ending on a.d. VII Kal. Mart. and the other picking ...