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Calculate derivatives of astronomical parameters. Code adapted from ETERNA.
astro_der(t_astro, simon)
astronomical time
coefficient matrix
derivative astonomical parameters
Wenzel, H.-G. (1996): The nanogal software: Earth tide data processing package ETERNA 3.3. Bulletin d'Informations Marees Terrestres vol. 124, 9425-9439, Bruxelles 1996.