Check this out: http://www.symmttm.com/pdf/NYTimes_T...p_09-30-04.pdf
Atomic clock has accuracy of +/- 1 sec over 30 million years.
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Atomic clocks
Check this out: http://www.symmttm.com/pdf/NYTimes_T...p_09-30-04.pdf
Atomic clock has accuracy of +/- 1 sec over 30 million years.
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