The 2008

Leap years are needed so that the calendar is in alignment with the earth's motion around the sun. Using a calendar of 365 days, would result in an error of 0.2422 days or almost 6 hours per year. In 100 years, this would result in a calendar 24 days ahead of the seasons. It is more desirable to align the calendar with the seasons and make the difference as small as possible. Every year divisible by 4 is a leap year. Every year divisible by 100 is NOT a leap year. Unless the year is divisible by 400, then it is still a leap year.

Because we are experiencing leaf year that is why it's 29...this reason can be learn through PHYSICAL SCIENCE subject why there is a leaf year.