Jacobus Cornelius Kapteyn

English: Jacobus Cornelius Kapteyn (1851–1922) was a Dutch astronomer.

Nederlands: Jacobus Cornelius Kapteyn (1851–1922) was een Nederlans astronoom.

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  Jacobus Cornelius Kapteyn (1851 – 1922)
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  Picture of Jacobus Cornelius Kapteyn made at the Mount Wilson Observatory in 1908.
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  Painting of J.C. Kapteyn at his desk
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  Jacobus Cornelis Kapteyn (1851-1922) painted by Jan Pieter Veth (1864-1925)
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