Titlebook: Reports on Astronomy; Richard M. West (General Secretary of the Union) Book 1985 Springer Science+Business Media Dordrecht 1985 Astrometry

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Astronomical Telegrams,The bulk of the Commission’s work has, as in previous years, been carried out most efficiently by the I.A.U. Bureau, especially by its Director, Dr. B.G. Marsden.

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Mecanique Celeste,Celestial Mechanics has undergone, in the past three years, a considerable development that has been marked by a significant increase of published papers and by the recent organization of several specialized colloquia or symposia. The reasons of this increase of interest may be found among the following circumstances:

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Positional Astronomy,The president thanks those members contributing material to this report. The volume of the material necessitated some editing, but no substantive omissions occurred. Whenever available, AAA numbers are used in lieu of complete titles of publications to help conserve space.

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Atomic and Molecular Data,ossibility is to include nuclear processes and fundamental particle physics. On the other hand a rationale for limiting the scope of our activities might be the direct application to astronomical observations. Astronomical theorists are usually better placed to access the fundamental data themselves

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Rotation of the Earth,(LLR) have been recognized. It resulted in the proposal to organize an one-month campaign of observations in 1985 in order to complement the COTES collocation program and to allow additional intercomparisons with other techniques.

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Light of the Night Sky,rms of average values. Therefore both sources of information are complementary and a synthesis can only be achieved by synoptic interpretation of zodiacal light, micrometeoroid, and meteoroid investigations also including dynamical aspects. Measurements of zodiacal light (and emission) from rockets,

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