Titlebook: Nutation and the Earth’s Rotation; E. P. Fedorov,M. L. Smith,P. L. Bender Book 1980 International Astronomical Union 1980 Variation.earth.

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Nutation Terms Derived from the Z- and the τ-Term of the IPMS SystemThe non-polar common terms, z and τ, of the IPMS system are analyzed for determining amplitudes of some terms of the forced nutation. The method of analysis and the results obtained are described briefly. Comparison is made with theoretical and other observational results. A fuller account of this work will be published elsewhere.

诱惑

Fresco

Nearly Diurnal Free Polar Motion Derived from Astronomical Latitude and Time ObservationsThe first attempts to take into account the dynamic effect of a liquid core on the rotation of the Earth were made as far back as the end of the 19th century.

Intrepid

Elimination de Certains Effets dans les Observations à l’Astrolabe: Application à l’Évaluation de CoLe travail entrepris ici porte sur les mèmes observations de latitude effectuées à Paris, au moyen d’astrolabes, que celles, utilisées dans d’autres études (Capitaine, Chollet et Débarbat, 1977; Capitaine, 1977). Pour des raisons qui apparaitront plus loin nous n’avons pu utiliser que la période comprise entre septembre 1970 et le début de 1977.

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Recherche de Termes de Nutation Dans l’Analyse des Observations de Latitude Effectuées á ParisLes données utilisées dans ce travail sont les observations de latitude couvrant une durée de vingt années (1956 a 1976). Le programme d’observation est resté inchangé et les réductions ont toutes été effectuées dans le Système du FK4 et des Constantes adoptée par l’UAI en 1968.

吸气

A Determination of the Principal Term of NutationThe method for deriving the amplitudes of the principal term of nutation from the z-term of latitude and the corresponding term of UT (here denoted by w) is well known (Yokoyama, 1977).

Intractable

高调

Flinch

Reduction of the Past ILS Data in a Uniform Systemon the constitution of the Earth’s interior. Indeed, the results of analyses of the nutations agree well with those predicted by theory for a fluid core. This shows that the matter of the outer core, 3,000 km and more below the Earth’s surface, is not only in a fused state but also is a “fluid” whic

Landlocked

For a Clear Terminology in the Polar Motion Investigationshese two words even if picturesque are fundamentally unprecise. They perhaps help to describe — in the English language — the nature of the movement but in no way correspond to the classical terminology of fundamental mechanics. They have apparently no convenient translation into the other usual lan