KAPTEYN, JACOBUS CORNELIS (1851–1922)

Astronomer. After his studies in physics and mathematics at Utrecht University, Kapteyn was appointed professor of astronomy and theoretical me chanics at Groningen University, where he founded an astronomical laboratory. He enjoyed international fame because of his research in the structure of stellar systems. Because he did not succeed in ob taining an observatory in Groningen, Kapteyn directed his studies to cataloging the stars in the Southern Hemisphere. In collaboration with David Gill of the observatory in Cape Town, he published The Cape Photographic Durchmusterung for the Equinox 1875 (3 vols., 1896–1900).