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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.

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 of the moon: the new moon (Kalendae or ...

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...

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

Feb 26, 2016 ... The ancient Egyptians did it, and so do we. Here's how a leap day—which occurs Februrary 29—helps keep our calendars and societies in ...

www.infoplease.com/leap-year-explained

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 ...

www.post-gazette.com/life/lifestyle/2016/02/26/A-Brief-History-of-Leap-Year/stories/201602280022

Feb 26, 2016 ... Leap year's origins go back to ancient astronomy. The Egyptians created a 365- day solar calendar but realized it wasn't accurate and also ...

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 ...

www.timeanddate.com/date/leapyear.html

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

www.huffingtonpost.com/2012/02/08/leap-year-its-origins-and-other-facts_n_1263273.html

Feb 8, 2012 ... If you've been anywhere near a calendar, you know that 2012 is a leap year, but you may not know why or how it started. However,

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 ...