Bissextile; a year containing 366 days; every fourth year which leaps over a day more than a common year, giving to February twenty-nine days. See Bissextile.

A year that has 366 days in it instead of 365. An extra day is added to the month of February for no other reason except that it's our shortest month. A leap year happens every four years.

Calculate leap years under a Gregorian calendar as follows: If a year is evenly divisible by 4,it is a leap year unless it is also evenly divisible by 100. If a year is evenly divisible by 100,it is not a leap year unless it is also evenly divisible by 400.

A calendar year containing 366 days. According to the present Gregorian calendar, all years with the date-number divisible by 4 are leap years, except century years. The latter are leap years when the date-number is divisible by 400.

A year with 366 in it. We have a leap year every 4 years.

in the Gregorian calendar: any year divisible by 4 except centenary years not divisible by 400

a year containing an extra rules reduce the number of different combinations of year length and starting never be adjacent to the weekly Sabbath i Reference

a year in which an extra day in added to the calendar in order to synchronize it with the seasons

a year in which an extra day in added to the calendar so it matches with the seasons

a year that has an extra day (to keep the calendar in synch with Earth's orbit around the sun) A leap second is an extra second added to a day to keep UTC in synch with Earth's rotation Sometimes, two leap seconds have to be added

a year whose number is divisible by four an integral number of times, except in the case of centennial years in which it is divisible by four hundred an integral number of times

a year whose number is divisible by four an integral number of times, except that if it is a centennial year (i

to account for the fact that it takes Earth 365.242196 days to orbit the sun, the Julian Calendar implemented a system by which every fourth year would have an extra day (366 instead of 365). These years are called leap years. Later, the Gregorian Calendar improved this correction by calling for every fourth year to be a leap year, unless the year is divisible by 100. This corrects the calendar to a year of 365.24 days, which is a good start but not perfect. So there is another condition: if a year is divisible by 400, it is a leap year. Therefore the year 1900 (divisible by 100, but not by 400) was not a leap year, but the year 2000 was a leap year.

In the Gregorian Calendar, leap years are observed as follows: Any year whose number is evenly divisible by 4 will have a 29-day February unless the last two digits of year number are 00. In that case, the year number must be evenly divisible by 400. For example, year 2000 was a leap year but in 2100, 2200 and 2300 February will have only 28 days.

Every fourth year, in which a 366th day is added since the Earth's revolution takes 365 days 5 hr 49 min.

Due to differences in year length between the modern solar calendar year and the Biblical lunar calendar year, a leap year is added to realign the calendars.

A calendar year with 366 days, inserted approximately every 4 years to make the average length of the calendar year as nearly equal as possible to the tropical year.

Leap years are years with an extra day (February 29); this happens almost every four years. Generally , leap years are divisible by four, but century years are special, they must also be divisible by 400. The year 2000 was a leap year. The years 2001, 2002, and 2003 are not.

A leap year (or intercalary year) is a year containing an extra day (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, February would have 29 days instead of just 28. Seasons and astronomical events do not repeat at an exact number of days, so a calendar which had the same number of days in each year would over time drift with respect to the event it was supposed to track.