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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.

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 day of the Hebrew year, now must never be ...

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.quora.com/What-is-the-main-reason-for-leap-year

TL;DR;. The simple reason for leap year is that the earth revolves around the sun in approximately 365.25 days, and so to make sure that a calendar ...

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...

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.

www.infoplease.com/leap-year-explained

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.huffingtonpost.com/2012/02/29/leap-year-2012-science-february-29-video_n_1309996.html

Feb 29, 2012 ... Once every four years in February, we're rewarded with a little gift: an extra day at the end of the month before we have to pay the rent. And for ...

www.scienceabc.com/eyeopeners/why-do-we-have-a-leap-day-leap-year-after-every-4-years.html

This teeny-tiny amount of time, when accumulated over 400 years, becomes as long as a day. That's the reason century years that are divisible by 400 are leap ...

blogs.discovermagazine.com/badastronomy/2012/02/29/why-we-have-leap-days-2

Feb 29, 2012 ... (25 leap years x 366 days/leap year) + (75 years x 365 days/year) ...... The best explanation of leap years was published about 250 years ago, ...