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) |
2008-12-25 | 54825 | 12 ns |
| 2008-12-18 | 54818 | 11 ns | 2008-12-11 | 54811 | 9 ns |
| 2008-12-04 | 54704 | 5 ns | 2008-11-27 | 54797 | 1 ns |
| 2008-11-20 | 54790 | -1 ns | 2008-11-13 | 54783 | -3 ns |
| 2008-11-06 | 54776 | -5 ns | 2008-10-30 | 54769 | -10 ns |
| 2008-10-23 | 54762 | -11 ns | 2008-10-16 | 54755 | -11 ns |
| 2008-10-09 | 54748 | -12 ns | 2008-10-02 | 54741 | -12 ns |
| 2008-09-25 | 54734 | -11 ns | 2008-09-16 | 54727 | -10 ns |
| 2008-09-11 | 54720 | -8 ns | 2008-09-04 | 54713 | -5 ns |
| 2008-08-28 | 54706 | -2 ns | 2008-08-21 | 54699 | 3 ns |
| 2008-08-14 | 54692 | 5 ns | 2008-08-07 | 54685 | 5 ns |
| 2008-07-31 | 54678 | 6 ns | 2008-07-24 | 54671 | 3 ns |
| 2008-07-17 | 54664 | 2 ns | 2008-07-10 | 54657 | 2 ns |
| 2008-07-03 | 54650 | 0 ns | 2008-06-26 | 54643 | -3 ns |
| 2008-06-19 | 54636 | -7 ns | 2008-06-12 | 54629 | -7 ns |
| 2008-06-05 | 54622 | -8 ns | 2008-05-29 | 54615 | -10 ns |
| 2008-05-22 | 54608 | -12 ns | 2008-05-15 | 54601 | -14 ns |
| 2008-05-08 | 54594 | -14 ns | 2008-05-01 | 54587 | -13 ns | 2008-04-24 | 54580 | -13 ns |
| 2008-04-17 | 54573 | -15 ns | 2008-04-10 | 54566 | -14 ns |
| 2008-04-03 | 54559 | -13 ns | 2008-03-27 | 54552 | -14 ns |
| 2008-03-20 | 54545 | -12 ns | 2008-03-13 | 54538 | -11 ns |
| 2008-03-06 | 54531 | -9 ns |
| 2008-02-28 | 54524 | -8 ns | 2008-02-21 | 54517 | -5 ns |
| 2008-02-14 | 54510 | -3 ns | 2008-02-07 | 54503 | -2 ns |
| 2008-01-31 | 54496 | -1 ns | 2008-01-24 | 54489 | 0 ns |
| 2008-01-17 | 54482 | 1 ns | 2008-01-10 | 54475 | 2 ns |
| 2008-01-03 | 54468 | 2 ns |
Online: September 2002 - Last update: January 5, 2009 - ep