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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)
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

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