Chapter Ix. 150

THE STARS. Distance of the stars—Life and work of Bessel—Studies of Struve—Life and work of Henderson—Work of Peters, Otto Struve, Brünnow, and Ball—Measures of Gill—Parallax of first-magnitude stars—Relative and absolute parallax—Work of Kapteyn—Application of photography—Star-catalogues—Argelander’s ‘Durchmusterung’—Work of Schönfeld—Work of Gould—The ‘Cape Photographic Durchmusterung’—Work of Gill and Kapteyn—International chart of the heavens—Work of Peck—Proper motions of the stars—Star-drift—Discoveries of Proctor and Flammarion—Radial motion—Work of Huggins, Vogel, and Campbell—Solar motion