Earth Rotation

Astrometry, Astronomical Reference Systems and Earth Rotation: New Challenges in the Microarcsecond Era
Our group organized a summer school and workshop bringing together more than 100 participants for lectures, practical training, and research discussions on astrometry, reference systems, and Earth rotation.
Aug 23, 2026 — Aug 29, 2026 Nanjing, China
Astrometry, Astronomical Reference Systems and Earth Rotation: New Challenges in the Microarcsecond Era
Astronomical determination of the Earth's dynamical flattening using VLBI observations and IAU 2006/2000 Precession-Nutation Model
VLBI celestial pole observations provide a consistent estimate of the Earth’s dynamical flattening for precession and nutation and recover long-term J₂ variations broadly consistent with satellite laser ranging.
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Astronomical determination of the Earth's dynamical flattening using VLBI observations and IAU 2006/2000 Precession-Nutation Model
The IAU 2006 precession quantities with an improved Earth's $J_{2}$ long-term variation
Nearly 50 years of satellite laser ranging observations support a parabolic model of Earth’s long-term $J_{2}$ variation. Incorporating this variation into the precession equations yields an updated solution with improved agreement with VLBI celestial pole offsets.
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The IAU 2006 precession quantities with an improved Earth's $J_{2}$ long-term variation