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Updated: May 8, 2025
Professor Kapteyn showed, in 1889, the practicability of deriving parallaxes wholesale from plates exposed at due intervals, and applied his system, in 1900, with encouraging success, to a group of 248 stars. The apparent absence of spurious shiftings justified the proposal to follow up the completion of the Astrographic Chart with the initiation of a photographic "Parallax Durchmusterung."
Searle, Harvard Annals, vol. xxix., p. 223; Boss, Astr. Roy. Messenger, vol. iv., p. 282; Hasselberg, Astr. Roy. Astr. Pac. Nach., Nos. 3,752, 3,753; Kapteyn, Ibid., No. 3,756; F. W. Very, Ibid., No. 3,771; and W. E. Wilson, Proc. Roy. Trans., vol. clviii., p. 540. Nach., No. 3,476; Astroph. Roy. Astr. Pac. Soc., vol. ii., p. 265; Proc. Roy.
Of corroborative testimony, moreover, is the discovery independently resulting from Gill's and Pickering's photographic reviews, that stars of the first type of spectrum largely prevail in the galactic zone of the heavens. With approach to that zone, Kapteyn noticed a steady growth of actinic intensity relative to visual brightness in the stars depicted on the Cape Durchmusterung plates.
The apex of the motion of what is called ``Stream I'' is situated, according to Professor Kapteyn, in right ascension 85°, declination south 11°, which places it just south of the constellation Orion; while the apex of ``Stream II'' is in right ascension 260°, declination south 48°, placing it in the constellation Ara, south of Scorpio.
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