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Leap years almost always occur every four years, (i.e. in years that are divisible by 4). The only exceptions to this is that years that are evenly divisible by 100 are not leap years, unless they are also divisible by 400.
So this means that the years 1700, 1800, 1900, etc., were not leap years, but the year 2000 was, and the years 2400 and 2800 will be.

www.rd.com/culture/leap-year-facts

Feb 29, 2016 ... From why we have leap years to the best ways to celebrate February 29, here are surprising facts about leap day.

www.cleveland.com/insideout/index.ssf/2016/02/post_462.html

Feb 24, 2016 ... Curious about why we have one extra day stuck to the end of February every four years? Here are 10 fun facts about leap years and leap days.

www.telegraph.co.uk/news/newstopics/howaboutthat/9113311/Top-20-craziest-facts-about-leap-years.html

Feb 29, 2012 ... Everyone knows why we have leap years - to keep our calenders in sync, stupid - but here are some crazy facts about February 29 that won't ...

www.mirror.co.uk/news/uk-news/16-leap-year-facts-2016-7104207

Jan 1, 2016 ... This year is a leap year, with 366 days instead of 365. But do you know many of us will work a day for free in 2016? And that leap years don't ...

www.usatoday.com/story/news/nation-now/2016/02/26/leap-day-february-29-calendar/80618064

Feb 26, 2016 ... Surrounded in history and superstition, February 29 only comes once every four years— and we have one Monday. Here are a few facts about ...

www.cnn.com/2013/08/14/world/leap-year-fast-facts/index.html

Feb 20, 2017 ... Read CNN's Fast Facts about leap year. 2020 is a leap year, and leap day is February 29, 2020, on a Saturday.

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.kidzworld.com/article/29996-leap-year-fun-facts

Feb 23, 2016 ... You probably know some basic facts about leap years (especially because this year is a leap year), but have you ever thought about how odd it ...

metro.co.uk/2016/02/29/for-29th-feb-29-things-that-happened-on-leap-day-5665119

Feb 29, 2016 ... Once-every-four-years Leap Day is just around the corner, and so to celebrate here's a look at 29 things that have taken place on February 29.