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The driving idea, in organizing this Symposium on "Relativity in
Celestial Mechanics . and Astrometry" was that, in recent years,
the ac curacy of several Astrometric techniques has so much
increased that re lativistic effects are no more marginally
mentioned in academic presen tations but have become an intrinsic
part of the interpretation of all the positional data. Techniques
such as V. L. B. I., space probes, lunar lasers, etc . . . have
greatly contributed to reduce the accuracy level to an angular
equivalent of a few milliarc-seconds. HIPPARCOS will extend this
trend to stellar astrometry and new proposals aim at gaining ano
ther one or two orders of magnitude in observing precision. In
paral lel, great progress has also been made in the theories of
motion of ce lestial bodies and more rigourous treatments within
the frame of general relativity become necessary. The definition of
reference frames and of various coordinate times become also a
major problem in the intercompa rison of observations produced by
different methods. This Symposium gave to people using relativistic
corrections in reducing their measurements or in constructing
various theories of mo tion a chance to exchange their experience
in the field and to confront it with theoreticians in general
relativity. The Symposium was approved by the IAU in 1983 and it
was organi zed by the Institute of Theoretical Astronomy of the
USSR Academy of Sciences on May 28-31, 1985."
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