Strontium atomic clock accurate to the second — over 15 billion years

21 abril 2015

In another advance at the far frontiers of timekeeping , 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://feeds.sciencedaily.com/~r/sciencedaily/~3/wXsCT5VEFKo/150421132031.htm