Feb. 29 is more than just an extra day we have once every four years. There is some science behind it. Here's how leap days ...

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 Earth to orbit the Sun, according to the ...

We've used leap years for over 2,000 years so our calendars are more in sync with the Earth’s rotation around the Sun. What is a leap year? Generally we define a year as 365 days, but a full ...

Every fourth year, those extra quarter-days get added to the calendar to make one full day – February 29. 2 This means every leap year has 366 days! 3 A leap year happens when the year can be ...

Many Western countries — including the U.S. — use the Gregorian calendar, which is based on a system of 365 days (plus a leap day every four years). Lunar New Year is based the moon's 12 phases.

The emperor Caesar adopted a 365-day calendar and added 10 days to it, including a leap day in February every four years, writes Calendar.com. Eventually, the calendar we all know was adopted by ...