[en] The author demonstrates the formulae on stellar reductions and puts them sheltered from the errors or the negligence that occur in the usual formulae, before making use of it for the determination of constants nutation and annual aberration. [fr] L’auteur démontre les formules sur les réductions stellaires et les met à l’abri des erreurs ou des négligences qui se rencontrent dans les formules usuelles, avant d’en faire usage pour la détermination des constantes de la nutation et de l’aberration annuelles.
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