An official website of the United States government
Here's how you know
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

 

Earth Orientation Products

 
 
USNO, as the IERS Rapid Service/Prediction Center, provides daily, weekly, and long-term data products.  Data files and plots are categorized into daily, weekly, and long-term products.  The Bulletin A, updated every Thursday, is available here.  An archive of past issues of Bulletin A is here.  
 
Daily Solutions
Daily data files available at IERS.  Updated daily (normally around 17:05 UTC), for highest accuracy real-time applications.
 
Weekly Solutions
Standard data files available at IERS.  Updated weekly on Thursdays.  Plots of Bulletin A combination and residuals.  Statistical report for contributed series.
 
Long-term Delta T
Monthly determination of Delta T (TT - UT1) since 1973 and long-term predictions.  Determinations of Delta T are updated approximately quarterly, and long-term predictions from finals.data are updated annually.  Data available at cddis.
 
Navy.mil  |  Navy.com  |  Navy FOIA  |  DoD Accessibility/Section 508  |  No Fear Act  |  Open Government  |  Plain Writing Act 
USA.gov  |  Veterans Crisis Line  |  DoD Safe Helpline  |  Navy SAPR  |  NCIS Tips  |  Privacy Policy  |  Contact Webmaster
 
Commander, Naval Meteorology and Oceanography Command  |  1100 Balch Blvd.  |   Stennis Space Center, Mississippi 39529
Official U.S. Navy Website
Veteran's Crisis Line