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) |
| 2001-12-27 | 52270 | -6 ns |
| 2001-12-20 | 52263 | -4 ns |
| 2001-12-13 | 52256 | 3 ns |
| 2001-12-06 | 52249 | 8 ns |
| 2001-11-29 | 52242 | 14 ns |
| 2001-11-22 | 52235 | 11 ns |
| 2001-11-15 | 52228 | 19 ns |
| 2001-11-08 | 52221 | 19 ns |
| 2001-11-01 | 52214 | 21 ns |
| 2001-10-25 | 52207 | 23 ns |
| 2001-10-18 | 52200 | 24 ns |
| 2001-10-11 | 52193 | 31 ns |
| 2001-10-04 | 52186 | 29 ns |
| 2001-09-27 | 52179 | 27 ns |
| 2001-09-20 | 52172 | 23 ns |
| 2001-09-13 | 52165 | 13 ns |
| 2001-09-06 | 52158 | 11 ns |
| 2001-08-30 | 52151 | 5 ns |
| 2001-08-23 | 52144 | -4 ns |
| 2001-08-16 | 52137 | -14 ns |
| 2001-08-09 | 52130 | -25 ns |
| 2001-08-02 | 52123 | -36 ns |
| 2001-07-26 | 52116 | -37 ns |
| 2001-07-19 | 52109 | -40 ns |
| 2001-07-12 | 52102 | -42 ns |
| 2001-07-05 | 52095 | -43 ns |
| 2001-06-28 | 52088 | -43 ns |
| 2001-06-21 | 52081 | -39 ns |
| 2001-06-14 | 52074 | -37 ns |
| 2001-06-07 | 52067 | -32 ns |
| 2001-05-31 | 52060 | -29 ns |
| 2001-05-24 | 52053 | -25 ns |
| 2001-05-17 | 52046 | -22 ns |
| 2001-05-10 | 52039 | -20 ns |
| 2001-05-03 | 52032 | -16 ns |
| 2001-04-26 | 52025 | -11 ns |
| 2001-04-19 | 52018 | -6 ns |
| 2001-04-12 | 52011 | -3 ns |
| 2001-04-05 | 52004 | 0 ns |
| 2001-03-29 | 51997 | 16 ns |
| 2001-03-22 | 51990 | 10 ns |
| 2001-03-15 | 51983 | 7 ns |
| 2001-03-08 | 51976 | 5 ns |
| 2001-03-01 | 51969 | 7 ns |
| 2001-02-22 | 51962 | 8 ns |
| 2001-02-15 | 51955 | 14 ns |
| 2001-02-08 | 51948 | 16 ns |
| 2001-02-01 | 51941 | 20 ns |
| 2001-01-25 | 51934 | 15 ns |
| 2001-01-18 | 51927 | 14 ns |
| 2001-01-11 | 51920 | 10 ns |
| 2001-01-04 | 51913 | 7 ns |