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Leap Years are so named because they cause fixed holidays, which usually advance one weekday per year, to "leap ahead" one day in the week.

Leap year - Wikipedia

en.wikipedia.org/wiki/Leap_year

A leap year is a calendar year containing one additional day added to keep the calendar year .... The Roman calendar originated as a lunisolar calendar and named many of its days after the syzygies ...

Why do we have leap year? - Ask History

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...

All About Leap Day - History in the Headlines

www.history.com/news/all-about-leap-day

Feb 29, 2012 ... It's February 29—Happy Leap Day! Find out more about the intriguing history of leap year, as well as some fun facts and famous people with ...

Why Do We Have Leap Year? | Dictionary.com Blog

blog.dictionary.com/leap-year/

Feb 28, 2016 ... Called the Gregorian calendar, this new system said that no century year (like 1900) would be a leap year except for centuries divisible by 400 ...

Leap Year Explained - Infoplease

www.infoplease.com/spot/leapyear1.html

A common year has 365 days and a leap year 366 days, with the extra, or intercalary, day designated as February 29. A leap year occurs every four years to ...

The Surprising History Behind Leap Year - National Geographic News

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

Feb 26, 2016 ... Most of the modern world has adopted the Gregorian calendar and its leap year system to allow days and months to stay in step with the ...

Leap Year Nearly Every four years - Timeanddate.com

www.timeanddate.com/date/leapyear.html

Feb 29, 2016 ... Is 2016 a leap year? A leap year has 366 days, as opposed to a common year, which has 365. We add a leap day – February 29 – nearly every ...

Leap Year 2012: The Science And History Behind Feb. 29 (VIDEO ...

www.huffingtonpost.com/2012/02/29/leap-year-2012-science-february-29-video_n_1309996.html

Feb 29, 2012 ... Once every four years in February, we're rewarded with a little gift: an extra day at the end of the month before we have to pay the rent. And for ...

Leap Year Inventor, History and Origins - Inventors - About.com

inventors.about.com/cs/inventionsalphabet/a/leap_year.htm

Julius Caesar was behind the origins of a leap year to allow the established Roman yearly calendar keep pace with the actual rotation of the earth around the  ...