Titlebook: Astrometric Binaries; An International Con Zdeněk Kopal,Jürgen Rahe Book 1985 D. Reidel Publishing Company, Dordrecht, Holland 1985 astrome

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Forschen – Patentieren – VerwertenOn the basis of Bessel’s classical papers . and . compact formulae are given to interpret the observed variations in the shifted lines of SS433 in terms of nutational and precessional effects of a disk in a binary system

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Forschen – Patentieren – VerwertenConcepts of relativistic astrometry — such as Weyl’s stellar compass or the concept of ‘flat-space plus forces’ — are discussed. To visualize effects from light deflection pictures showing the stellar sky as seen from the vicinity of a strongly gravitating source are presented.

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Forschen – Patentieren – VerwertenFollowing the kind invitation of Prof. Kopal, I am going to refer at this Conference on current work carried out by the IAU Commission 26, after having circulated a letter to all members to collect recent information at various places. I am grateful to those who replied in time for this report, which will also contain some personal considerations.

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