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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 ...

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.

science.howstuffworks.com/science-vs-myth/everyday-myths/question50.htm

The reason we care about our orbital position around the sun is because of the seasons. In the ... So 1700, 1800 and 1900 were not leap years, but 2000 was.

www.infoplease.com/leap-year-explained

Learn what leap year is and why we need it. The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both ...

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 ...

news.nationalgeographic.com/2016/02/160226-leap-year-science-time-world-cultures-february

Feb 26, 2016 ... The ancient Egyptians did it, and so do we. Here's how a leap day—which occurs Februrary 29—helps keep our calendars and societies in ...

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 ...