NIST Time Scale Data Archive Updated monthly

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2001

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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)
2006-12-28	54097	24 ns
2006-12-21	54090	22 ns
2006-12-14	54083	20 ns
2006-12-07	54076	16 ns
2006-11-30	54069	12 ns
2006-11-23	54062	9 ns
2006-11-16	54055	6 ns
2006-11-09	54048	0 ns
2006-11-02	54041	-6 ns
2006-10-26	54034	-11 ns
2006-10-19	54027	-15 ns
2006-10-12	54020	-16 ns
2006-10-05	54013	-16 ns
2006-09-28	54006	-13 ns
2006-09-21	53999	-10 ns
2006-09-14	53992	-6 ns
2006-09-07	53985	-5 ns
2006-08-31	53978	-3 ns
2006-08-24	53971	-2 ns
2006-08-17	53964	-1 ns
2006-08-10	53957	1 ns
2006-08-03	53950	2 ns
2006-07-27	53943	3 ns
2006-07-20	53936	3 ns
2006-07-13	53929	7 ns
2006-07-06	53922	8 ns
2006-06-29	53915	11 ns
2006-06-22	53908	14 ns
2006-06-15	53901	15 ns
2006-06-08	53894	16 ns
2006-06-01	53887	17 ns
2006-05-25	53880	18 ns
2006-05-18	53873	19 ns
2006-05-11	53866	20 ns
2006-05-04	53859	19 ns
2006-04-27	53852	18 ns
2006-04-20	53845	19 ns
2006-04-13	53838	18 ns
2006-04-06	53831	15 ns
2006-03-30	53824	12 ns
2006-03-23	53817	11 ns
2006-03-16	53810	7 ns
2006-03-09	53803	6 ns
2006-03-02	53796	3 ns
2006-02-23	53789	2 ns
2006-02-16	53782	1 ns
2006-02-09	53775	0 ns
2006-02-02	53768	2 ns
2006-01-26	53761	1 ns
2006-01-19	53754	0 ns
2006-01-12	53747	3 ns
2006-01-05	53740	5 ns

Online: September 2002 - Last update: January 4, 2007 - ep