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) |
| 2002-12-26 | 52634 | 6 ns |
| 2002-12-19 | 52627 | 4 ns |
| 2002-12-12 | 52620 | 4 ns |
| 2002-12-05 | 52613 | 5 ns |
| 2002-11-28 | 52606 | -4 ns |
| 2002-11-21 | 52599 | 3 ns |
| 2002-11-14 | 52592 | 4 ns |
| 2002-11-07 | 52585 | 2 ns |
| 2002-10-31 | 52578 | 6 ns |
| 2002-10-24 | 52571 | 6 ns |
| 2002-10-17 | 52564 | 6 ns |
| 2002-10-10 | 52557 | 6 ns |
| 2002-10-03 | 52550 | 5 ns |
| 2002-09-26 | 52543 | 5 ns |
| 2002-09-19 | 52536 | 5 ns |
| 2002-09-12 | 52529 | 0 ns |
| 2002-09-05 | 52522 | -5 ns |
| 2002-08-29 | 52515 | -2 ns |
| 2002-08-22 | 52508 | -6 ns |
| 2002-08-15 | 52501 | -8 ns |
| 2002-08-08 | 52494 | -9 ns |
| 2002-08-01 | 52487 | -5 ns |
| 2002-07-25 | 52480 | -5 ns |
| 2002-07-18 | 52473 | -4 ns |
| 2002-07-11 | 52466 | -2 ns |
| 2002-07-04 | 52459 | 0 ns |
| 2002-06-27 | 52452 | 2 ns |
| 2002-06-20 | 52445 | 6 ns |
| 2002-06-13 | 52438 | 10 ns |
| 2002-06-06 | 52431 | 11 ns |
| 2002-05-30 | 52424 | -13 ns |
| 2002-05-23 | 52417 | -14 ns |
| 2002-05-16 | 52410 | -13 ns |
| 2002-05-09 | 52403 | -5 ns |
| 2002-05-02 | 52396 | -8 ns |
| 2002-04-25 | 52389 | -12 ns |
| 2002-04-18 | 52382 | -14 ns |
| 2002-04-11 | 52375 | -17 ns |
| 2002-04-04 | 52368 | -15 ns |
| 2002-03-28 | 52361 | -23 ns |
| 2002-03-21 | 52354 | -21 ns |
| 2002-03-14 | 52347 | -25 ns |
| 2002-03-07 | 52340 | -17 ns |
| 2002-02-28 | 52333 | -18 ns |
| 2002-02-21 | 52326 | -19 ns |
| 2002-02-14 | 52319 | -27 ns |
| 2002-02-07 | 52312 | -28 ns |
| 2002-01-31 | 52305 | -25 ns |
| 2002-01-24 | 52298 | -26 ns |
| 2002-01-17 | 52291 | -26 ns |
| 2002-01-10 | 52284 | -20 ns |
| 2002-01-03 | 52277 | -12 ns |