NIST Time Scale Data Archive |
| Return to Archive index | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | Current Year |
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) |
| 2009-12-31 | 55196 | 13 ns | 2009-12-24 | 55189 | 16 ns |
| 2009-12-17 | 55182 | 18 ns | 2009-12-10 | 55175 | 18 ns |
| 2009-12-03 | 55168 | 19 ns | 2009-11-26 | 55161 | 18 ns |
| 2009-11-19 | 55154 | 17 ns | 2009-11-12 | 55147 | 13 ns |
| 2009-11-05 | 55140 | 9 ns | 2009-10-29 | 55133 | 7 ns |
| 2009-10-22 | 55126 | 3 ns | 2009-10-15 | 55119 | -1 ns |
| 2009-10-08 | 55112 | -4 ns | 2009-10-01 | 55105 | -6 ns |
| 2009-09-24 | 55098 | -8 ns | 2009-09-17 | 55091 | -11 ns |
| 2009-09-10 | 55084 | -12 ns | 2009-09-03 | 55077 | -13 ns |
| 2009-08-27 | 55070 | -14 ns | 2009-08-20 | 55063 | -14 ns |
| 2009-08-13 | 55056 | -14 ns | 2009-08-06 | 55049 | -12 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: January 5, 2010 - ep