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Steve said, responding to me: >The length of the year is almost 365.25 days, so a leap day every fourth >year is almost right, but it is not exactly 365.25, so higher order >corrections are needed. The above statement of rules is nowhere near >complete :-) RIghto. Remember, there was a leap-second added this year! That's a completely different issue. The leap-second has to do with the fact that the length of a day varies a bit. The rules about leap-years have to do with the number of days it takes for the earth to rotate around the sun. These are separate issues (obviously related in that both depend on the length of the day), but two quite separate sets of connections (i.e. 86,400 leap seconds do not make a leap day)