A leap year also known as an intercalary year or bissextile year is a calendar year containing an additional day or, in the case of lunisolar calendars , a month added to keep the calendar year synchronized with the astronomical or seasonal year. By inserting also called intercalating an additional day or month into the year, the drift can be corrected. A year that is not a leap year is called a common year. For example, in the Gregorian calendar , each leap year has days instead of , by extending February to 29 days rather than the common
Which years are leap years and can you have leap seconds?
The History of Leap Year
Nearly every four years is a leap year which has days, as opposed to a common year , which has in the Gregorian Calendar. Last leap day was February 29, It takes the Earth approximately However, the Gregorian calendar has only days in a year, so if we didn't add a leap day on February 29 nearly every four years, we would lose almost six hours off our calendar every year. After only years, our calendar would be off by around 24 days! The leap day is an extra, or intercalary, day and we add it to the shortest month of the year, February. Roman general Julius Caesar introduced the first leap years over years ago.
List of Leap Years
The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both common years and leap years. A common year has days and a leap year days, with the extra--or intercalary --day designated as February To compensate for this discrepancy, the leap year is omitted three times every four hundred years. In other words, a century year cannot be a leap year unless it is divisible by Thus , , and were not leap years, but , , and are leap years.
Question Last updated Apr 23 Originally posted Apr 22 PM. Your Email Address:.