We'll have an extra day on the calendar this February, but don't get used to it. Here's when the next leap year is, and when ...

This year is a leap year, meaning Feb. 29 was added as the 366th day on the calendar. Here's what to know about its meaning, ...

The Romans added January and February to the calendar but ran into a problem — math and superstition. Here's why February ...

Eventually, the calendar we all know was adopted by Pope Gregory XIII in 1582, and it's changed little since then — not that the system is flawless. February gets a leap year once every four ...

Leap Year ensures it remains that way, explains Duke physics professor Ronen Plesser in this short video. Plesser breaks down the math behind adding a day to the calendar every four years so that we ...

What to know about February and leap year. Why do we have a leap years? Leap years account for the inaccurate measure of time on the 365-day calendar. Technically it takes 365.242190 days for the ...