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) |
2010-02-25 | 55252 | 3 ns |
| 2010-02-18 | 55245 | 1 ns | 2010-02-11 | 55238 | 2 ns |
| 2010-02-04 | 55231 | 4 ns | 2010-01-28 | 55224 | 5 ns |
| 2010-01-21 | 55217 | 7 ns | 2010-01-14 | 55210 | 8 ns |
| 2010-01-07 | 55203 | 9 ns |
Online: September 2002 - Last update: March 1, 2010 - ep