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NIST Time Scale Data Archive

Updated monthly


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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)

 

2003-12-25  

52998

-16 ns

2003-12-18   52991

-17 ns

2003-12-11   52984

-12 ns

2003-12-04   52977

-13 ns

2003-11-27   52970

-12 ns

2003-11-20   52963

-12 ns

2003-11-13   52956

-9 ns

2003-11-06   52949

-7 ns

2003-10-30   52942

-7 ns

2003-10-23   52935

-4 ns

2003-10-16   52928

-4 ns

2003-10-09   52921

-4 ns

2003-10-02   52914

-3 ns

2003-09-25   52907

-2 ns

2003-09-18   52900

-3 ns

2003-09-11   52893

-2 ns

2003-09-04   52886

0 ns

2003-08-28   52879

0 ns

2003-08-21   52872

2 ns

2003-08-14   52865

4 ns

2003-08-07   52858

4 ns

2003-07-31   52851

3 ns

2003-07-24     52844

5 ns

2003-07-17   52837

6 ns

2003-07-10   52830

5 ns

2003-07-03   52823

5 ns

2003-06-26   52816

-5 ns

2003-06-19   52809

-4 ns

2003-06-12   52802

-1 ns

2003-06-05   52795

1 ns

2003-05-29   52788

1 ns

2003-05-22   52781

-3 ns

2003-05-15   52774

-7 ns

2003-05-08   52767

-8 ns

2003-05-01   52760

-6 ns

2003-04-24   52753

-6 ns

2003-04-17   52746

-9 ns

2003-04-10   52739

-7 ns

2003-04-03   52732

-2 ns

2003-03-27   52725

-4 ns

2003-03-20   52718

-4 ns

2003-03-13   52711

-1 ns

2003-03-06   52704

2 ns

2003-02-27   52697

4 ns

2003-02-20   52690

1 ns

2003-02-13   52683

3 ns

2003-02-06   52676

3 ns

2003-01-30   52669

9 ns

2003-01-23   52662

9 ns

2003-01-16   52655

8 ns

2003-01-09   52648

8 ns

2003-01-02   52641

8 ns