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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) |
| 2009-07-30 | 55042 | -8 ns | 2009-07-23 | 55035 | -6 ns |
| 2009-07-16 | 55028 | -2 ns | 2009-07-09 | 55021 | 0 ns |
| 2009-07-02 | 55014 | 3 ns |
| 2009-06-25 | 55007 | 5 ns | 2009-06-18 | 55000 | 8 ns |
| 2009-06-11 | 54993 | 8 ns | 2009-06-04 | 54986 | 8 ns |
| 2009-05-28 | 54979 | 10 ns | 2009-05-21 | 54972 | 8 ns |
| 2009-05-14 | 54965 | 8 ns | 2009-05-07 | 54958 | 8 ns |
| 2009-04-30 | 54951 | 9 ns | 2009-04-23 | 54944 | 8 ns |
| 2009-04-16 | 54937 | 8 ns | 2009-04-09 | 54930 | 8 ns |
| 2009-04-02 | 54923 | 5 ns | 2009-03-26 | 54916 | 4 ns |
| 2009-03-19 | 54909 | 5 ns | 2009-03-12 | 54902 | 4 ns |
| 2009-03-05 | 54895 | 5 ns | 2009-02-26 | 54888 | 6 ns |
| 2009-02-19 | 54881 | 7 ns | 2009-02-12 | 54874 | 8 ns |
| 2009-02-05 | 54867 | 9 ns | 2009-01-29 | 54860 | 9 ns |
| 2009-01-22 | 54853 | 11 ns | 2009-01-15 | 54846 | 12 ns |
| 2009-01-08 | 54839 | 12 ns | 2009-01-01 | 54832 | 11 ns |
Online: September 2002 - Last update: August 5, 2009 - ep
