Titlebook: Astrometric Techniques; Proceedings of the 1 Heinrich K. Eichhorn,Robert J. Leacock Conference proceedings 1986 International Astronomical

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Concepts of Reference Systemstheir underlying principles (non-rotation of very distant objects, constancy of the frequencies associated to atomic transitions). The paper is an attempt to clarify the role of these natural references with respect to those which are implicitly defined by the dynamical theories..The example of time

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Relativistic Reduction of Astrometric Observationstronomical practice. One may offer three possible ways to overcome the related difficulties:.In this paper we prefer the second way. After formulating the heliocentric planetary and geocentric satellite equations of motion, the general technique for relativistic reduction in astrometry and geodynami

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Statistical Analysis of Proper Motion Surveysthe solar neighborhood. Major obstacles to the full use of proper motions have long been posed by: (1) incompleteness of proper motion surveys, (2) proper motion bias in kinematic studies, and (3) the indirect approaches and kinematical assumptions needed in traditional luminosity studies.

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The Search for Unwanted Signals: Systematic Trends in Proper Motions of Fundamental Starsome consequences are indicated for the determination of cluster parallaxes, of secular parallaxes and of the galactic rotation. In general, we stress the necessity of always searching for . signal in the data — including those ones which are not understood and hence not ‘wanted’.

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