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>...
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.
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 ...
Feb 28, 2011 ... Leap years are divisible by four of course – but it's a little more complicated ...
The leap year rule that has been in place since 1582 is a bit more ...
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 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.
However, this made the average length of the calendar-year slightly longer than
... Its rules are 1) years divisible by 400 ARE leap years (so, for example, 2000 ...
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 ...
Mar 1, 2016 ... Leap Year 2016: Why does February have 29 days every four years? .... The
added rule about centuries (versus just every four years) was an ...
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.