C. Kapteyn on the plates of the Cape Photographic Durchmusterung.
C. Kapteyn and E.
C. Kapteyn A =18 h 14 m D = + 290.5.
C. Kapteyn, with the result that it appears to be not even approximately accordant with the facts.
For the higher magnitudes C. Kapteyn has.
Thus Kapteyn found that the Bradley stars having proper motions greater than 5" per century were evenly distributed over the sky.
Our principal knowledge of this subject is due to Kapteyn (Groningen Publications Nos.
Kapteyn finds that magnitude for magnitude, the absolute brightness of the solar stars is only one-fifth of that of the Sirian stars, so that in the mean they must be at less than half the distance.