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Leap years almost always occur every four years, (i.e. in years that are divisible by 4). The only exceptions to this is that years that are evenly divisible by 100 are not leap years, unless they are also divisible by 400.
So this means that the years 1700, 1800, 1900, etc., were not leap years, but the year 2000 was, and the years 2400 and 2800 will be.

Leap year


[edit]. In the Gregorian calendar, the current standard calendar in most of the world, most years that are multiples of 4 are ...

Leap Year Nearly Every four years - Time and Date


Feb 29, 2012 ... However, the Gregorian calendar has only 365 days in a year, so if we didn't add a leap day on February 29 nearly every four years, we would ...

Next Leap Day: February 29, 2016 - Time and Date


A Leap Year consists of 366 days – not 365 – where February 29 is added as an extra ... A Leap Day, February 29, is added to the calendar during leap years.

After prompting endless questions in discussion boards and other forums, this quirk of the calendar turned out to be a vastly successful hoax. To change from their current Julian date to the Gregorian one the Swedes needed to lose eleven days; however, instead of dropp... More »
By Robert Wilde, About.com Guide

Leap Year 101 – Next, When, List, Days, Calendar, Years ...


Learn what leap year is, when it is and why we need it.

When is the next leap year? | Human World | EarthSky


Hence, according to the rules set forth in the Gregorian calendar leap years have ... An extra day added to the calendar every four years at leap year helps ...

When is Leap Year? When is the next Leap Day? | The Old Farmer's ...


A “Leap” Day is an extra day on February 29 which is added nearly every 4 years to today's Gregorian calendar. A “leapling” is a person born in a leap year.

News - Leap Year 2016 puts Feb 29 back on the calendar. Here's ...


Jan 26, 2016 ... In 2016, February 29 is making a return after a four year hiatus, marking this as a Leap Year. So, what's the reason for this periodic addition to ...

Leap Year 2016: Why does February have an extra day every four ...


Jan 28, 2016 ... A complete orbit of the earth around the sun takes exactly 365.2422 days to complete, but the Gregorian calendar uses 365 days. So leap ...

Popular Q&A
Q: What years are leap years? calendar and days of the week.
A: It takes the earth about 365.2422 days to go around the sun, but a normal calendar year is only 365 days. The extra fraction of a day adds up: circling the sun ... Read More »
Source: mathforum.org
Q: What is a leap year in a calendar.
A: A leap year is a year containing one extra day in order to keep the calendar year synchronized with the astronomical or seasonal year. For example, in the Grego... Read More »
Source: www.answers.com
Q: When is leap year added to a calendar?
A: every 4 years.2012 will be the next leap year. Read More »
Source: wiki.answers.com
Q: Why are leap years included in the calendar?
A: Leap years in solar calendars are to make up for the fact that a year is not an exact multiple of a day. Leap years in luni-solar calendars are to make up for t... Read More »
Source: wiki.answers.com
Q: How does a leap year affect the calendar?
A: There's an extra day (29th of Feb. in leap years. Ps. It sucks to be born on 29th of Feb. Read More »
Source: answers.yahoo.com