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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 4 years - Time and Date


Leap years and leap days are used to allow our calendar to keep up with the Earth's revolutions around the Sun. Nearly every 4 years is a Leap Year in our ...

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


A Leap Day, February 29, is added to the calendar in Leap Years. This extra ( intercalary) day makes the year 366 days long – and not 365 days, like a common ...

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 Leap Year? - The Old Farmer's Almanac


Find out the next Leap Day, how to calculate Leap Years, Leap Year folklore, and more ... 29 which is added nearly every 4 years to today's Gregorian calendar.

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 ...

Leap Year 2012: Why We Need February 29


Feb 29, 2012 ... Find out why we need February 29, when leap day was adopted, and how cultures with other systems for tracking time handle their calendars.

When Is The Next Leap Year - Virtual Perpetual Calendars


However, as we can see from the leap years listed below - there are years in which we do not have a leap year. This is as a result of the Gregorian calendar ...

Popular Q&A
Q: Who invented the first leap year calendar?
A: Leap year is invented in 45B.C and the person who made in is Cosmo Mercavular Read More »
Source: wiki.answers.com
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: 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
Q: Leap years and the Mayan calendar?
A: I'm glad to see that you've has looked into this 'Mayans never counted leap years' nonsense instead of blindly taking it at face value, but you've missed the ma... Read More »
Source: answers.yahoo.com