Once every four years, an extra day is added to the month of February. That year is considered a leap year, and February 29 is known as a leap day. Leap years exist because it takes the Earth 365 days ...
Amazon S3 on MSN
Leap years explained: why February sometimes gets an extra day
Leap years account for the Earth’s 365.2420-day orbit, with complex rules deciding when an extra day is added to February.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback