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    • Leap Year Open site in a new window - Brief discussion on the reason for leap years, including graphs. From Eric Weisstein's World of Astronomy.
    • Leap Years Open site in a new window - Find out how leap years came about, and how a certain year is determined to be a leap year. From the Royal Greenwich Observatory.
    • timeanddate.com: Why Leap Years? Open site in a new window - Explains why leap years are used in modern calendars, the history behind the day, and how to calculate a leap year.
    • Why Do We Have Leap Years? Open site in a new window - Explanation of the occurrence from Cecil Adams' The Straight Dope.
    • Wikipedia: Leap Year Open site in a new window - Article describing the complex process in which a leap year is calculated using the Gregorian, Julian, Chinese, Hebrew, Hindu, and Iranian calendars.
    		 



     
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