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Kapteyn may refer to: Jacobus Kapteyn - Astronomer Parallactic instrument of Kapteyn - the instrument used by Kapteyn to analyze photographic plates Jacobus Kapteyn Telescope - telescope named after Jacobus Kapteyn Kapteyn's Star - star named after Jacobus Kapteyn Kapteyn (crater) - Lunar crater named after Jacobus Kapteyn Kapteyn Astronomical Institute - Dutch Astronomical Institute named after Jacobus Kapteyn Paul Joan George Kapteyn - Dutch judge