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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 ... In this model, leap years occur ever four years except for years evenly divisible by 100 and not by 400. For example, the year 1900 was not a leap year because it was divisible by 100, ... The Origins of "Hillbilly" and "Redneck".

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 ...

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 ...

www.infoplease.com/leap-year-explained

Learn what leap year is and why we need it. The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both ...

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.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.timeanddate.com/date/leap-day-february-29.html

Why do some women propose to their men on leap day? ... People born on February 29 are all invited to join The Honor Society of Leap Year Day Babies.

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 ...