CHAMP CHAllenging Minisatellite Payload.- CHAMP Mission 5 Years in Orbit.- Remarks on CHAMP Orbit Products.- Harmonic Analysis of the Earth's Gravitational Field from Kinematic CHAMP Orbits based on Numerically Derived Satellite Accelerations.- Earthquake Signatures in the Ionosphere Deduced from Ground and Space Based GPS Measurements.- Global Atmospheric Sounding with GPS Radio Occultation aboard CHAMP.- GRACE The Gravity Recovery and Climate Experiment.- Design and Operation of the GRACE ISDC.- De-aliasing of Short-term Atmospheric and Oceanic Mass Variations for GRACE.- Integrated Sensor Analysis GRACE.- Static and Time-Variable Gravity from GRACE Mission Data.- Gravity Field Recovery from GRACE-SST Data of Short Arcs.- Mapping Earth's Gravitation Using GRACE Data.- High Frequency Temporal Earth Gravity Variations Detected by GRACE Satellites.- GOCE The Gravity Field and Steady-State Ocean Circulation Explorer.- From Kinematic Orbit Determination to Derivation of Satellite Velocity and Gravity Field.- Mission Simulation and Semi-analytical Gravity Field Analysis for GOCE SGG and SST.- GOCE Gravity Field Modeling: Computational Aspects - Free Kite Numbering Scheme.- An Integrated Global/Regional Gravity Field Determination Approach based on GOCE Observations.- High-Performance GOCE Gravity Field Recovery from Gravity Gradient Tensor Invariants and Kinematic Orbit Information.- The Impact of Temporal Gravity Variations on GOCE Gravity Field Recovery.- Quality Assessment of GOCE Gradients.- Color Figures.- IERS The International Earth Rotation and Reference Systems Service.- IERS Data and Information System.- IERS Analysis Coordination.- Analysis and Refined Computations of the International Terrestrial Reference Frame.- Combination of VLBI Analysis Results.- Towards a Rigorous Combination of Space Geodetic Observations for IERS Product Generation.- CONT02 Analysis and Combination of Long EOP Series.- Conventional and New Approaches for Combining Multi-Satellite Techniques.- GEOsensor Ring Laser for Seismology.- The GEOsensor Project: Rotations - a New Observable for Seismology.- Airborne Gravimetry.- Evaluation of Airborne Vector Gravimetry Using GNSS and SDINS Observations.- SAGS4 - StrapDown Airborne Gravimetry System Analysis.- Further Development of a High Precision Two-Frame Inertial Navigation System for Application in Airborne Gravimetry.