Over the 43 years I was employed by NIST to look into cool measurement strategies. in fact some nice things did come up. In large measure this was due to the contributions and stimulation provided by a large number of excellent and enthusiastic young colleagues. See http://jilawww.colorado.edu/hall/ .
This present website is an experiment to see if web publication of ideas, cool ideas, used circuits, and half- crazy suggestions will be valuable to the user community.

I'm sorry that the detailed and carefully-researched information separating "great" stuff and crazy stuff has been misplaced in my office.
Clock accuracy vs time
Marrison : Accuracy vs Epoch