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http://aa.usno.navy.mil/AA/faq/docs/leap_years.html
The U. S. Naval Observatory is the authority on matters involving astronomy and the calendar. Because so many people have asked them about leap year, they have prepared a clear, concise scientific answer on the subject.
http://www.tondering.dk/claus/cal/node3.html#SECTION00321000000000000000
Claus Tondering, for all his zeros, offers some very interesting details about the Leap Year rules.
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