@danR2
i found that the NIST site (as usual) to be helpful.
try: https://www.nist.gov/news-events/news/2018/11/nist-atomic-clocks-now-keep-time-well-enough-improve-models-earth
i found that the NIST site (as usual) to be helpful.
try: https://www.nist.gov/news-events/news/2018/11/nist-atomic-clocks-now-keep-time-well-enough-improve-models-earth