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en.wikipedia.org/wiki/Leap_year

A leap year is a calendar year containing one additional day added to keep the calendar year ... In the Baha'i Calendar, a leap day is added when needed to ensure that the following year begins on the vernal equinox. The name "leap ... The Gregorian reform modified the Julian calendar's scheme of leap years as follows:.

www.timeanddate.com/date/leapyear.html

Feb 29, 2016 ... We add a leap day – February 29 – nearly every four years. ... Leap years are needed to keep our modern day Gregorian calendar in alignment ...

www.history.com/news/ask-history/why-do-we-have-leap-year

Feb 19, 2014 ... Nearly every four years, we add an extra day to the calendar in the form of February 29, also known as Leap Day. Put simply, these additiona...

www.infoplease.com/leap-year-101-next-when-list-days-calendar-years-calculation-last-rules

Most years that can be divided evenly by 4 are leap years. (For example, 2016 divided by 4 = 504: Leap year!) 2. Exception: Century years are NOT leap years ...

www.infoplease.com/leap-year-explained

The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both common years and leap years. A common year ...

gizmodo.com/5889231/why-do-we-need-leap-years

Feb 29, 2012 ... You probably know that its existence is something to do with the Earth orbiting the sun, but why exactly do we have leap years? And isn't there ...

www.quora.com/What-are-leap-years-and-why-are-they-necessary

Leap years are a year with an extra day, 366 instead of 365. The reason leap years are needed is to keep a calendar in tune with the seasons. It takes the earth ...

www.cbsnews.com/news/leap-years-needed-and-leap-babies-share-bond

Feb 29, 2012 ... There's sound scientific explanation for having leap days every four years, and " leapers" enjoy being part of unique club.

www.telegraph.co.uk/news/uknews/12177017/Leap-Year-2016-Why-does-February-have-29-days-every-four-years.html

Mar 1, 2016 ... When is it, why does it happen and everything else you need to know about the leap year in 2016.

www.theguardian.com/science/2011/feb/28/leap-year-alex-bellos

Feb 28, 2011 ... This is confusing, so a British mathematician has suggested switching to a better rule, but before I get to that, this is why leap years are needed ...