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Published online by Cambridge University Press: 04 August 2017
A preliminary analysis has been made of data in the forthcoming edition of the Yale Parallax Catalogue to study the possibility of defining a system of observatory zero-points and external accuracies. Based on this analysis and those of several other authors, I conclude that it is not likely that a unique system of zero-points can be established. It may, however, be possible to establish some values for the average external accuracy of the parallaxes, but more work remains to be done on both of these issues. These conclusions are in agreement with those reached by several other authors.