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:The frequency of about every 18 months is correct for all leap seconds between 1 January 1972 and 31 December 2005, including the initial 6 month interval and the final 84 month interval, because the mathematical average during that period was 17.7 months. A graph showing the relationship of UTC to UT1 can be found at [http://hpiers.obspm.fr/eop-pc/earthor/utc/leapsecond.html], showing that there was no attempt to 'catch up'. Rather, Earth's rate of rotation actually sped up slightly during 1997. — [[User:Joe Kress|Joe Kress]] 21:15, 30 July 2005 (UTC)
I quite liked this: http://www.post-gazette.com/pg/05210/545823.stm although I have no idea if it's suitable as an external link on the article.
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