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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. More precisely, 0.36826 is quite close to 7 ⁄ 19 (about 0.3684211): several lunisolar calendars have 7 leap months in every cycle of 19 years (called a ' Metonic cycle ').
For example, any year that is evenly divisible by 4,000 is automatically a common year, and century years are only considered leap years if they can be evenly divided by 400.
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 ...
February always is the odd month out by being the shortest. But this year, it gets an extra day. ... The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not. ...
A leap year is when an extra day is added to our modern-day Gregorian calendar — the world’s most widely used calendar, named after Pope Gregory XIII — during the shortest month of the year ...
The solar year does not have a whole number of lunar months (it is about 365/29.5 = 12.37 lunations), so a lunisolar calendar must have a variable number of months per year. Regular years have 12 months, but embolismic years insert a 13th "intercalary" or "leap" month or "embolismic" month every second or third year.
The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.
A year may be a leap year if it is evenly divisible by 4. Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason ...