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) |
2005-12-29 | 53733 | 5 ns |
| 2005-12-22 | 53726 | 4 ns | 2005-12-15 | 53719 | 5 ns |
| 2005-12-08 | 53712 | 7 ns | 2005-12-01 | 53705 | 7 ns |
| 2005-11-24 | 53697 | 5 ns | 2005-11-17 | 53691 | 4 ns |
| 2005-11-10 | 53684 | 3 ns | 2005-11-03 | 53677 | 1 ns |
| 2005-10-27 | 53670 | -2 ns | 2005-10-20 | 53663 | -4 ns |
| 2005-10-13 | 53656 | -4 ns | 2005-10-06 | 53649 | -4 ns |
| 2005-09-29 | 53642 | -4 ns | 2005-09-22 | 53635 | -7 ns |
| 2005-09-15 | 53628 | -8 ns | 2005-09-08 | 53621 | -9 ns |
| 2005-09-01 | 53614 | -10 ns | 2005-08-25 | 53607 | -10 ns |
| 2005-08-18 | 53600 | -10 ns | 2005-08-11 | 53593 | -7 ns |
| 2005-08-04 | 53586 | -5 ns | 2005-07-28 | 53579 | -2 ns |
| 2005-07-21 | 53572 | 1 ns | 2005-07-14 | 53565 | 4 ns |
| 2005-07-07 | 53558 | 7 ns | 2005-06-30 | 53551 | 7 ns |
| 2005-06-23 | 53544 | 9 ns | 2005-06-16 | 53537 | 9 ns |
| 2005-06-09 | 53530 | 7 ns | 2005-06-02 | 53523 | 7 ns |
| 2005-05-26 | 53516 | 4 ns | 2005-05-19 | 53509 | 3 ns |
| 2005-05-12 | 53502 | 4 ns | 2005-05-05 | 53495 | 1 ns |
| 2005-04-28 | 53488 | 1 ns | 2005-04-21 | 53481 | 2 ns |
| 2005-04-14 | 53474 | 0 ns | 2005-04-07 | 53467 | -1 ns |
| 2005-03-31 | 53460 | -1 ns | 2005-03-24 | 53453 | -3 ns |
| 2005-03-17 | 53446 | -3 ns | 2005-03-10 | 53439 | -3 ns |
| 2005-03-03 | 53432 | -2 ns | 2005-02-24 | 53425 | -1 ns |
| 2005-02-17 | 53418 | -1 ns | 2005-02-10 | 53411 | 0 ns |
| 2005-02-03 | 53404 | 0 ns | 2005-01-27 | 53397 | 3 ns |
| 2005-01-20 | 53390 | 6 ns | 2005-01-13 | 53383 | 13 ns |
| 2005-01-06 | 53376 | 11 ns |
Online: September 2002 - Last update: August 9, 2007 - ep