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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