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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)
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

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