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Groningen, and others.[9]
On analysis of the directions of proper
motions of stars in all parts of the heav-
ens, Kapteyn has shown[10] that these indi-
cate, besides the solar motion towards Her-
cules, two general drifts of stars in nearly
opposite directions, which can be detected
in any part of the heavens. This result
has been confirmed from independent data
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