How do you calculate leap years?

Answer

Ask.com Answer for: how to calculate leap years
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.
Q&A Related to "How do you calculate leap years?"
1. Divide the year for which you are trying to determine a leap year by four. If the year is not divisible by four, it is not a leap year. If the year is divisible by four, continue
http://www.ehow.com/how_7546950_calculate-leap-yea...
The modern civil/business calendar inserts February 29th in a leap year. Every year divisible by '4' is a leap year, except for the last year of each Century . 1800, 1900, 2000, etc
http://wiki.answers.com/Q/How_are_the_leap_years_c...
During a leap year, one extra day is added to the year during the month of February making 366 day of that year. Leap years occur every 4 years unless it is a century year, then it
http://www.ask.com/web-answers/Society/Other/how_o...
Rule 1: Any year evenly divisible by 400 IS a leap year. Rule 2: Any year evenly divisible by 100 is NOT a leap year, unless it conflicts with Rule 1. Rule 3: Any year evenly divisible
http://answers.yahoo.com/question/index?qid=200712...
1 Additional Answer

A day on Earth does not really last 24 hours. It takes 23 hours, 56 minutes and 4.1 seconds for the Earth to make a complete rotation. Because of this, the Earth actually rotates about 365.24 times per year. Adding an extra day every four years helps to synchronize the calendar year with the solar year. If the discrepancy were exactly one quarter of a year, then every four years would be a leap year without variation. Since the difference is 0.24 instead of 0.25, one leap year is skipped three times out of every 400 years. Leap year originated in the 16th century, when people realized that the vernal equinox was falling on March 11 instead of March 21. Pope Gregory XIII adjusted the calendar by moving the date ahead by 11 days and instituted the practice of adding an extra day to the calendar every four years.

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Leap years occur every 4 years. During a leap year, there is one extra day in February, and 366 days in that year. ...
A leap year is a year in which one extra day has been inserted, or intercalated, at the end of February. A common year has 365 days and a leap year 366 days, with ...
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