en.wikipedia.org/wiki/Leap_year

A leap year is a year containing one additional day added to keep the calendar
year .... February 29 is a date that usually occurs every four years, and is called
leap day. This day is added to the ...

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. ... A leap year occurs
every 4 years in the Ethiopian calendar when one extra day is added ...

www.infoplease.com/spot/leapyear2.html

This would shorten the calendar every so often and rid it of the annual excess of
11 minutes and 14 seconds. So in addition to the rule that a leap year occurs ...

www.wwu.edu/skywise/leapyear.html

There is a leap year every year whose number is perfectly divisible by four -
except for years which are both divisible by 100 and not divisible by 400.

www.enchantedlearning.com/time/leapyear/

A leap year is a year that has one extra day in it. A leap year occurs roughly every
four years. Most years have 365 days, but a leap year has 366 days. The extra ...

www.telegraph.co.uk/news/uknews/12177017/Leap-Year-2016-Why-does-February-have-29-days-every-four-years.html

Mar 1, 2016 ... When is it, why does it happen and everything else you need to know about the
leap year in 2016.

www.huffingtonpost.com/jacob-stewart/think-leap-year-is-every-_b_9131516.html

Feb 29, 2016 ... Because for the most part, Leap Year is every four years. But not ... Well if you
happen to survive to the year 2100, remember this article and be ...

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 ... In
this model, leap years occur ever four years except for years ...

earthsky.org/earth/why-do-we-need-leap-years

Feb 29, 2016 ... It's that .25 that creates the need for a leap year every four years. ... In fact, a solar
year occurs over a period of 365.2422 days. Hence ...

www.slate.com/blogs/bad_astronomy/2016/02/29/the_math_behind_leap_years.html

Feb 29, 2016 ... Adding in a leap day every four years gets the calendar way closer to being
accurate, but it's still not exactly on the money; it's still just a hair out ...