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/leapyear1.html

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.mathsisfun.com/leap-years.html

Leap Years are any year that can be evenly divided by 4 (such as 2012, 2016,
etc). not ... So another rule says that every 400 years is a leap year again.

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

Feb 29, 2016 ... Well if you happen to survive to the year 2100, remember this article and be
prepared to skip Leap Year (okay, so maybe reading this article ...

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.almanac.com/content/when-next-leap-year

Adding an extra day, aka a leap day, to the calendar every 4 years brings the .....
Then yesterday I was discussing when leap years occur and how some are and ...

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

Feb 29, 2016 ... 29 is a leap day, it only comes once every four years. Advertisement. But why is
leap day only a quadrennial event? Why is anything anything?

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 ...

www.reference.com/science/leap-year-occur-b0e5b326c6a1b313

A leap year occurs almost every four years on February 29. In order for a year to
be a leap year, it must be evenly divisible by 4; however, if the year is evenly ...