Titlebook: Selected Exercises in Galactic Astronomy; I. Atanasijevi? Book 1971 D. Reidel Publishing Company, Dordrecht, Holland 1971 astronomy

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Determination of the Vertex of the Hyades Cluster,ing that all the cluster members are moving with equal velocities. The point on the celestial sphere towards which the total proper motions are directed is called the vertex of the moving cluster (or its convergent point).

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