NIST Time Scale Data Archive |
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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 |