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We have leap years in order to keep seasons, astronomical events, and time differences in sync.
Without leap years, the Gregorian calendar would lose veracity in just over a hundred years, leading to time differences between day and night.

Leap year - Wikipedia

en.wikipedia.org/wiki/Leap_year

A leap year is a calendar year containing one additional day added to keep the calendar year ..... One reason for this rule is that Yom Kippur, the holiest day in the Hebrew calendar and the tenth d...

Leap Year Nearly Every four years - Time and Date

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.

Leap Year Explained - Infoplease

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 ...

Leap Year Rules

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.

Why do we have leap year? - Ask History

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 February 29, also known as Leap Day. Put simply, these additiona...

Leap Year 2016 February 29th - why is there an extra day every four ...

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

Mar 1, 2016 ... Leap Year 2016: Why does February have 29 days every four years? .... The extra second can sometimes cause problems for some networks ...

Why is there a leap year? The science behind February 29 Leap ...

metro.co.uk/2016/02/26/the-science-behind-why-we-have-a-leap-year-every-four-years-5720043/

Feb 26, 2016 ... 2016 is a leap year, meaning we have one extra day on February 29, but ... why February drew the short straw, there's a (slightly unfair) reason.

2016 is a leap year | Earth | EarthSky

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

Feb 29, 2016 ... The reason is that Earth takes approximately 365.25 days to orbit around the sun every year. It's that .25 that creates the need for a leap year ...

Leap Years - Math is Fun

www.mathsisfun.com/leap-years.html

A Leap Year has 366 days (the extra day is the 29th of February). ... Leap Years are any year that can be evenly divided by 4 (such as 2012, 2016, etc). not ...