- Wikipedia: Leap Year
Article describing the complex process in which a leap year is calculated using the Gregorian, Julian, Chinese, Hebrew, Hindu, and Iranian calendars.
en.wikipedia.org/wiki/Leap_year
- timeanddate.com: Why Leap Years?
Explains why leap years are used in modern calendars, the history behind the day, and how to calculate a leap year.
www.timeanddate.com/date/leapyear.html
- Leap Year
Brief discussion on the reason for leap years, including graphs. From Eric Weisstein's World of Astronomy.
scienceworld.wolfram.com/astronomy/LeapYear.html
- Why Do We Have Leap Years?
Explanation of the occurrence from Cecil Adams' The Straight Dope.
www.straightdope.com/mailbag/mleapyr.html
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