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RE: "Scientists Issue Ominous Prediction"
No, the earth's rotation doesn't not slow PERIODICALLY. It changes over time. From Wikipedia:
Atomic clocks show that a modern-day is longer by about 1.7 milliseconds than a century ago,[1] slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend of 2.3 milliseconds per century since the 8th century BCE.[2]
Interesting!