NOTICE TO USERS
Commander, Naval Meteorology and Oceanography Command is consolidating the command's web presence in accordance with Department of Defense (DoD) and Navy guidance. The U.S. Naval Oceanography portal will be the single access point for all public facing Meteorology and Oceanography products and services. This publicly-accessible portal is currently online at http://www.usno.navy.mil and is being populated. In the near future, non-DoD users will be redirected to this portal. DoD customers can access all operational data, products and services via the NIPRNet Naval Oceanography Portal site at https://oceanography.navy.mil (CAC required). |
U.S. Naval Observatory | Earth Orientation Department |
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The IERS Rapid Service/Prediction Center is the product center of the International Earth Rotation and Reference Systems Service responsible for providing Earth orientation parameters (EOPs) on a rapid turnaround basis. This service is primarily intended for real-time users and others needing the highest quality EOP information sooner than is available in the IERS final series (Bulletin B) published by the IERS Earth Orientation Center, which is based at the Observatoire de Paris. | |
This Center is an activity of the Earth
Orientation (EO) Department at the U.S. Naval
Observatory (USNO). The mission of the USNO includes determining the positions
and motions of celestial bodies, measuring the Earth's rotation and orientation,
maintaining the master clock for the U.S., and disseminating precise time (atomic and
astronomical). The EO Dept. contributes to this mission by collecting suitable
observations and performing data analyses to determine and predict the time-varying
orientation of the terrestrial reference frame within the quasi-inertial celestial
reference frame. The key parameters determined and disseminated are polar motion
coordinates, Universal Time (UT1), precession, and nutation.
The user community is very broadly based, the main applications involving principally
high-accuracy navigation and positioning, particularly in real-time and near real-time
modes. Contact Information: 202-762-0242 (primary); 202-762-1444 (alternate) |
2009 IERS Bulletin A Vol. XXII Website
General Information about Earth Orientation
NO positive leap second will be introduced at the end of December 2009.
The last leap second was positive and was introduced in UTC at the end of December 2008.
(see IERS Bulletin C 38)
IERS Bulletin A -- Rapid Service/Prediction of Earth Orientation
Additional information concerning IERS Bulletin A:
Publications about IERS Bulletin A:
Standard data files available by anonymous ftp -- now updated weekly (Thursday), prior to 1 July 2002 (Tuesday and Thursday):
Daily data files available by anonymous ftp -- updated daily (normally about 17:05 UTC), for highest accuracy real-time applications
Delta T values
Discontinued data files -- no longer available:
IERS Bulletin B ("Final" EOP values)
IERS Bulletin C (Leap Second Announcements)
IERS Bulletin D (Announcements of DUT1)
General Publications
Send comments to ser7 at maia.usno.navy.mil or | |
U.S. Naval Observtory, EO Dept. Attn: ser7 | |
3450 Massachusetts Avenue NW | |
Washington, DC 20392-5420 | last updated 01 September 2009 |