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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 .... 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".

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 ...

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 ...

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.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.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.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 ...

www.ibtimes.com/leap-year-2012-why-does-leap-day-exist-strange-facts-traditions-history-feb-29-explained-417932

Feb 29, 2012 ... This means that 1900 was not a Leap Year, but 2000 was! Origins and History of Leap Day. The Ancient Egyptians were the first to discover the ...