Abstract
ROTATION OF THE GALAXY.—The fact that the spectroscope revels rotation in several spiral nebulæ renders it not unprobable that a similar motion may be present in the galaxy, which has many points of resemblance to the spirals; it is not very easy, however, to detect a small systematic effect of this kina from star observations. Mr. J. H. Oort makes the attempt in Bull. Astr. Inst. Neth., No. 132. He makes the assumption that there is unlikely to be any systematic motion at right angles to the galaxy; he therefore deduces the precession from proper motions resolved in that direction and finds a correction to Newcomb's precession of l″.37 per century and a rotational effect of about 1″/2 per century.
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Our Astronomical Column. Nature 120, 491 (1927). https://doi.org/10.1038/120491a0
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DOI: https://doi.org/10.1038/120491a0