[en] In the hypothesis of a fluid layer inside Earth, the motions of precession, of nutation and secular variations aren’t the only one to affect the earth’s axis. In this case, it’s subject to a diurnal nutation which we can’t consider as insensitive. Here, the author deals with the motion of earth’s axis in the hypothesis of a completely solid Earth. [fr] Dans l’hypothèse d’une couche fluide à l’intérieur de la Terre, les mouvements de précession, de nutation et de variations séculaires ne sont pas les seuls qui affectent l’axe du monde. Dans ce cas, il est soumis à une nutation diurne qu’on ne peut considérer comme insensible. Ici, l’auteur s’occupe des mouvements de l’axe du monde que dans l’hypothèse d’une Terre entièrement solide.
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