Leap year A leap year is a year containing one additional day in order to keep the calendar year synchronized with the astronomical or seasonal year. A year that is not a leap year is called a common year. For example, in the Gregorian calendar (a common solar calendar), February in a leap year has 29 days instead of the usual 28, so the year lasts 366 days instead of the usual 365 Leap years are added to the calendar to keep it working properly. The 365 days of the annual calendar are meant to match up with the solar year. A solar year is the time it takes the Earth to complete its orbit around the Sun about one year. But the actual time it takes for the Earth to travel around the Sun is in fact a little longer than that ,it’s about 365 ¼ days (365 days, 5 hours, 48 minutes, and 46 seconds, to be precise). So the calendar and the solar year don’t completely match—the calendar year is a touch shorter than the solar year.
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The entire 2012 calendar is the same as that for 1984, and can be used again in 2040. Any full-year leap year calendar repeats every 28 years. (Not accounting for non-leap century years such as 1900 and 2100.)