ACTIVITY

Foreword: The IERS in 1999, by the Directing Board Chairman

1. ORGANIZATION OF THE INTERNATIONAL EARTH ROTATION SERVICE

2. COORDINATING CENTRES

   1. Very Long Baseline Interferometry (VLBI)
   2. Lunar Laser Ranging (LLR)
   3. Global Positioning System (GPS)
   4. Satellite Laser Ranging (SLR)
   5. Doppler Orbit determinations and Radiopositioning Integrated on Satellite (DORIS)

3. BUREAUS

   1. Central Bureau
   2. Celestial System Section of the Central Bureau
   3. ITRF Section of the Central Bureau
   4. EOP Section of the Central Bureau
   5. Sub-Bureau for Rapid Service and Predictions
   6. Global Geophysical Fluids

RESULTS

1. IERS REFERENCES AND THE ROTATION OF THE EARTH
   The IERS Conventions (incl. ICRS, ITRS)
   The Earth Orientation Parameters
   Irregularities of the Earth's rotation
2. ANALYSIS CENTRES GLOBAL SOLUTIONS
3. CELESTIAL REFERENCE SYSTEM AND FRAME
4. TERRESTRIAL REFERENCE FRAME
5. EARTH ORIENTATION
6. CONSISTENCY OF IERS RESULTS
7. ACCESS TO IERS RESULTS
   Analysis Centers and Central Bureau
   Sub-bureau for Rapid Service and Predictions