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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...

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.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 ...

news.nationalgeographic.com/2016/02/160226-leap-year-science-time-world-cultures-february

Feb 26, 2016 ... It's that time again: This Monday, February 29, is a leap day, the calendar oddity that occurs (almost) every four years. For centuries, trying to ...

news.nationalgeographic.com/news/2012/02/120229-leap-year-day-february-29-calendar-cultures-science

Feb 29, 2012 ... Leap Year Needed to Correct Calendar Drift ... Egypt adopted a leap-year system , with an extra day every four years, during the Greek rule of ...

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.slate.com/blogs/bad_astronomy/2016/02/29/the_math_behind_leap_years.html

Feb 29, 2016 ... Why do we have leap years? The math behind this is interesting, and has to do with Earth's spin and orbit around the Sun.