International Earth Rotation Service (IERS) Bulletin A: Rapid Earth Orientation Data

IERS Bulletins A and B provide current information on the Earth's orientation in the IERS Reference System. This includes Universal Time, coordinates of the terrestrial pole, and celestial pole offsets. Bulletin A gives an advanced solution updated twice weekly by e-mail subscription or daily by anonymous ftp; the standard solution is given monthly in Bulletin B and updated twice weekly in the (IERS) C04 solution. The Annual Report contains information on the data used, the models, the algorithms and the reference frames, as well as revised solutions for the past years. All solutions are continuous within their respective uncertainties. Bulletin A is issued by the IERS Rapid Service/Prediction Centre at the U.S. Naval Observatory, Washington ; Bulletin B is issued by the IERS Earth Orientation Centre at the Paris Observatory.

For scientific and long-term analyses of the Earth's orientation, users are advised to request the long-term continuous series maintained by the Earth Orientation Centre from 1846 (pole components), 1962 (UT), and 1981 (dPsi, dEpsilon) to the current date. All solutions are available electronically.