How many days is the year during leap year?
A leap year (or intercalary year) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, in the Gregorian calendar, February has 29 days in a leap year instead of the usual 28 – and consequently, the year lasts 366 days instead of the common 365. Because seasons and astronomical events do not repeat at an exact number of full days, a calendar that had the same number of days in each year would, over time, drift with respect to the event it was supposed to track. By occasionally inserting (or 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.
366 days during leap year. One day is added to the month of February. The reason this is done is because one year is equal to 365 1/4 days. If they didn’t do this, every year, summer would come 1/4 day earlier. After many years, summer would be happening in January and winter would be offset by the same number of days. The days in a year are not exactly 365 1/4 days either, but that’s really close. At some point, adding a leap day will not be sufficient and two leaps days (or no leap day) will have to be added with in the 4 year period.
