J. C. Kapteyn

The legacy of J.C. Kapteyn

The determination of the apex of the solar motion

On certain statistical data which may be valuable in the classification of the stars in the order of their evolution

On the distribution of the stars in space especially in the high galactic latitudes

On the upper limit of distance to which the arrangement of stars in space can at present be determined with some confidence

Plan of selected areas

On the parallaxes and motion of the brighter galactic helium stars between galactic longitudes 150⁰ and 216⁰

First and second report on the progress of the plan of selected areas

On the absorption of light in space

On the individual parallaxes of the brighter galactic helium stars in southern hemisphere

Skew frequency curves in biology and statistics