EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Assessing recently improved precession-nutation models 

José M. Ferrándiz1, Miguel A. Juárez1, Santiago Belda2, Tomás Baenas3, Sadegh Modiri4, Robert Heinkelmann4, Alberto Escapa1,5, and Harald Schuh4,6
José M. Ferrándiz et al.
  • 1Universidad de Alicante, Space Geodesy Group, Applied Mathematics, EPS, ALICANTE, Spain (
  • 2Image Processing Laboratory (IPL) - Laboratory of Earth Observation (LEO), University of Valencia, Valencia, Spain
  • 3University Centre of Defense, MDE-UPCT, Murcia, Spain
  • 4Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany
  • 5Department of Aerospace Engineering, University of León, León, Spain
  • 6Technische Universität Berlin (TU Berlin), Germany

In 2020 new estimations of nutation amplitudes or precession parameters have been published or presented at main meetings. The derivation of corrections to improve the current precession-nutation models was encouraged by Resolution 5 of the 2019 General Assembly of the International Association of Geodesy (IAG). Besides, the GGOS/IERS Unified Analysis Workshop held in October 2019 recommended that effort to be prioritized among the tasks of the current IAU/IAG Joint Working Group on Improving Theories and Models of the Earth’s rotation (JWG ITMER).

This presentation is intended to present comparisons of some of those new semi-empirical and semi-theorical precession-nutation models developed by different authors from either VLBI solutions of individual analysis centers or combinations of them. The models recently introduced by the authors that were reported at the AGU 2020 Fall Meeting are included in this assessment.

How to cite: Ferrándiz, J. M., Juárez, M. A., Belda, S., Baenas, T., Modiri, S., Heinkelmann, R., Escapa, A., and Schuh, H.: Assessing recently improved precession-nutation models , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-10180,, 2021.

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