How many days does a leap year have?
A common year has 365 days. But nearly every fourth year is a leap year (like 2016) and one day, called a leap day, is added to the end of February.
What are the reasons? It's a well-known fact that it takes Earth one year to circle around the Sun once, an exact time is 365 days, 5 hours, 48 minutes, and 45 seconds. But, according to the Gregorian calendar, each year consists only of 365 days. Are we ready to lose almost 6 hours each year? After a century that will make a 24 days loss! Time is money, so a leap day is added almost every fourth year to cover the inaccuracy of the calendar.