en.wikipedia.org/wiki/Leap_year

A leap year is a calendar 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 adde...

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.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.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.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.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.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 ...

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.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.