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Leap year

en.wikipedia.org/wiki/Leap_year

A leap year is a year containing one additional day added to keep the calendar year ... By this rule, the average number of days per year is 365 + <sup>1</sup>⁄4 − <sup>...

Leap Year Rules

www.wwu.edu/skywise/leapyear.html

There is a leap year every year whose number is perfectly divisible by four - except for years which are both divisible by 100 and not divisible by 400.

Leap Year Explained - Infoplease

www.infoplease.com/spot/leapyear1.html

This new rule, whereby a century year is a leap year only if divisible by 400, is the sole feature that distinguishes the Gregorian calendar from the Julian calendar ...

When is a leap year not a leap year? | Science | The Guardian

www.theguardian.com/science/2011/feb/28/leap-year-alex-bellos

Feb 28, 2011 ... The following rule, devised recently by British maths brainiac Adam P Goucher, is much cleverer: years divisible by 128 are not a leap year, ...

Method to determine whether a year is a leap year - Microsoft

support.microsoft.com/en-us/kb/214019

Any year that is evenly divisible by 4 is a leap year: for example, 1988, 1992, and ... only the year 1900 is subject to the 100/400 exclusion rule of leap years in ...

When is Leap Year? When is the next Leap Day? | The Old Farmers ...

www.almanac.com/content/when-next-leap-year

Find out the next Leap Day, how to calculate Leap Years, Leap Year folklore, and more on ... Here are the rules for leap year, just to set the record straight.

Leap Years - Math is Fun

www.mathsisfun.com/leap-years.html

Leap Years are any year that can be evenly divided by 4 (such as 2012, 2016, etc). except if it ... So another rule says that every 400 years is a leap year again.

Think Leap Year is Every Four Years? Think Again. - Huffington Post

www.huffingtonpost.com/jacob-stewart/think-leap-year-is-every-_b_9131516.html

Feb 29, 2016 ... Because for the most part, Leap Year is every four years. ... Well according to the rules of the Gregorian calendar, the exceptions to this rule are ...

Leap Year -- from Eric Weisstein's World of Astronomy

scienceworld.wolfram.com/astronomy/LeapYear.html

A leap year is a year in which an extra day is added to the calendar in order to ... The extra rule involving centuries is an additional correction to make up for the ...

algorithm - leap year calculation - Stack Overflow

stackoverflow.com/questions/725098/leap-year-calculation

In general terms the algorithm for calculating a leap year is as follows... A year will be a leap ... For century years, the 400 rule is important. Thus ...

Answer
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.
More Info

Leap Year Nearly Every four years - Timeanddate.com

www.timeanddate.com

Feb 29, 2016 ... A leap year has 366 days, as opposed to a common year, which has 365. ... But the Julian calendar had only one rule: any year evenly divisible ...

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

www.infoplease.com

Rules for Determining a Leap Year. 1. Most years that can be divided evenly by 4 are leap years. (For example, 2016 divided by 4 = 504: Leap year!) 2.

How could the year 2000 be a leap year when 1900 was not ...

science.howstuffworks.com

Putting all of these rules together, you can see that a year is a leap year not only if it is divisible by 4 -- it also has to be divisible by 400 if it is a centurial year.