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Matrix to multiply by astrological. Code adapted from ETERNA.
time_der_mat(time)
the times to calculate the derivatives of the astrological parameters
matrix of time derivatives
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.