What is a leap year?
A leap year is a year that has a longer February than normal. In a leap year, February has 29 days in it instead of 28.
Why do we need a leap year?
Leap year began in order to align the earth’s rotation around the sun with our seasons. It takes approximately 365.2422 days for the earth to travel around the sun in one year. We know that a typical year has 365 days in it—but as you can see from the number 365.2422, a year is not exactly 365 days! So, in order to get “lined up”, almost every four years, we give one extra day to account for the additional time the earth takes to travel around the sun.