What accounts for the Leap Year?

Answer 1

It takes about 365.2422 days for Earth to orbit the sun, but the number of days in a calendar year is always a whole number. In the Gregorian calendar, each regular year has 365 days and each leap year has 366 days. There are 97 leap years in every 400-year period. That makes the average length of a Gregorian calendar year 365.2425 days.

Answer 2

the earth actually takes 365.25 days to rotate the sun as it would be very difficult to have a day lasting only 6 hours we have decided to "save" the extra time until it amounts to a full day every 4 years.

Answer 3

A year that has 366 days rather than 365 is called a leap year. A year divisible by 4 (but not by 100) is a leap year. Years divisible by 500 are leap years.