"In another advance at the far frontiers of timekeeping by National
Institute of Standards and Technology (NIST) researchers, the latest
modification of a record-setting strontium atomic clock has achieved
precision and stability levels that now mean the clock would neither
gain nor lose one second in some 15 billion years*—roughly the age of
the universe".
http://www.nist.gov/pml/div689/20150421_strontium_clock.cfm
"Our performance means that we can measure the gravitational shift when
you raise the clock just 2 centimeters [0.79 inches] on the Earth's
surface," study co-author Jun Ye, a physicist at JILA, a joint institute
of the National Institute of Standards and Technology and the University
of Colorado, Boulder, said in a statement.
--
WBW,
V.P.
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