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What exactly is leap year and how does it work?

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A leap year happens every 4 years, and it adds one day to the calendar, for 366 days. Since a full year is 365.25 days, every four years they add a day to February (29th)

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The Gregorian calendar does't line up with the earth's rotation so we add an extra day every four years.

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A leap year happens every 4 years when February has 29 days instead of 28. So there are 366 days in a year instead of the usual 365. We do this so the calendar year stays aligned with the astronomical/seasonal year.

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Perfect! Well done!
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Oh! Yesterday I was gonna ask what's the purpose for it, but I didn't, and you answered my question perfectly!
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gracias :)
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Actually, we don't add an extra day every four years. The century year is a leap year only if the number of centuries is evenly divisible by four. The year 2000 was a leap year but 1900 wasn't and 2100 won't be.

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What
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Just what I wrote.
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There are 365.2425 days in a year, not 365.25.
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It's pretty god damn close
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Close only counts in horse-shoes and hand grenades.
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Good one
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Almost - a change of century is only a Leap Year if the number is divisible by 400 - as was the year 2000. The year 2100 can't be a Leap Year. This convention was set by the Scribes of Pope Gregory who worked all this stuff out. Medieval science was surprisingly good, because we haven't changed the system with our much greater knowledge today - but we do add or subtract Leap Seconds now to keep our clocks in total synchronisation with the stars. In his time, the seasons were hopelessly out-of-date with the 365-day calendar and the Pope appointed all the clever scientists to work out a solution. Gregory got our calendars back into sync with the weather by subtracting eleven days from the year changes were made. Peasants marched the streets in protest demanding their eleven days back!

The changes were made in 1582 and you can read all the fine details on http://en.wikipedia.org/wiki/Gregorian_Calendar

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A leap year is a year that leaps over other years.

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A leap year has 366 days... 2012 was a leap year.

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leap leap leap
366 days feb 29

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A leap year happens every 2 years/700 days, and it adds 1 day/24 hours with would change 365.25 days a year to 366 days a year it happens when February 29th is added to the year.

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It is a day but not every 2 years. See DrBrian and others above.
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