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# The NTP Timescale and Leap Seconds
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# http://www.eecis.udel.edu/~mills/leap.html
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# (which measures the true angular orientation of the earth in space); see
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# Terry J Quinn, The BIPM and the accurate measure of time,
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# Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>.