NIST Time Scale Data Archive Updated monthly

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UTC(USNO) - UTC(NIST)

The United States Naval Observatory (USNO) and the National Institute of Standards and Technology (NIST) make regular comparisons of their respective time scales. These comparisons are made using GPS common-view measurements from up to approximately 10 GPS satellites. The table below lists recent differences between the two time scales.

Weekly UTC(USNO, Master Clock) - UTC(NIST)Values

Date	MJD	UTC(USNO)-UTC(NIST) (+/- 20 ns)
2003-12-25	52998	-16 ns
2003-12-18	52991	-17 ns
2003-12-11	52984	-12 ns
2003-12-04	52977	-13 ns
2003-11-27	52970	-12 ns
2003-11-20	52963	-12 ns
2003-11-13	52956	-9 ns
2003-11-06	52949	-7 ns
2003-10-30	52942	-7 ns
2003-10-23	52935	-4 ns
2003-10-16	52928	-4 ns
2003-10-09	52921	-4 ns
2003-10-02	52914	-3 ns
2003-09-25	52907	-2 ns
2003-09-18	52900	-3 ns
2003-09-11	52893	-2 ns
2003-09-04	52886	0 ns
2003-08-28	52879	0 ns
2003-08-21	52872	2 ns
2003-08-14	52865	4 ns
2003-08-07	52858	4 ns
2003-07-31	52851	3 ns
2003-07-24	52844	5 ns
2003-07-17	52837	6 ns
2003-07-10	52830	5 ns
2003-07-03	52823	5 ns
2003-06-26	52816	-5 ns
2003-06-19	52809	-4 ns
2003-06-12	52802	-1 ns
2003-06-05	52795	1 ns
2003-05-29	52788	1 ns
2003-05-22	52781	-3 ns
2003-05-15	52774	-7 ns
2003-05-08	52767	-8 ns
2003-05-01	52760	-6 ns
2003-04-24	52753	-6 ns
2003-04-17	52746	-9 ns
2003-04-10	52739	-7 ns
2003-04-03	52732	-2 ns
2003-03-27	52725	-4 ns
2003-03-20	52718	-4 ns
2003-03-13	52711	-1 ns
2003-03-06	52704	2 ns
2003-02-27	52697	4 ns
2003-02-20	52690	1 ns
2003-02-13	52683	3 ns
2003-02-06	52676	3 ns
2003-01-30	52669	9 ns
2003-01-23	52662	9 ns
2003-01-16	52655	8 ns
2003-01-09	52648	8 ns
2003-01-02	52641	8 ns