Abstract
THE author of the catalogue before us is carrying out the suggestion of M. A. Donner that those observatories that finished their astrographic catalogue plates in good time should now repeat them, in order to determine proper motions. The Helsingfors plites were taken between 1892 and 1896; they were repeated, at similar hour-angles and calendar dates, between 1909 and 1913, giving an average time interval of seventeen years.
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CROMMELIN, A. New Determinations of Proper Motions of Stars 1 . Nature 99, 175 (1917). https://doi.org/10.1038/099175a0
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DOI: https://doi.org/10.1038/099175a0