On Wed 2018-08-29T19:49:59-0400 Bob kb8tq hath writ:
> A few more details about “traceability”. USNO is by statute the official 
> source of time for the US.

I suggest reading Matsakis, Levine, and Lombardi from this year's PTTI meeting.
USNO and NIST are both legal sources for the US.
The USNO site currently has a broken SSL cert, but the paper is also here
https://www.researchgate.net/publication/323600621_Metrological_and_legal_traceability_of_time_signals

--
Steve Allen                    <[email protected]>              WGS-84 (GPS)
UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
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