Contents
xxi
10.3 Groningen University
214
10.4 De Sitter and Leiden
217
11 The Kapteyn Universe
225
11.1 The First World War
225
11.2 Radial Velocities
227
11.3 Correspondence with Hale
229
11.4 Helium Stars
232
11.5 Walter Adams
235
11.6 The Structure of the Universe
237
11.7 The Spatial Distribution of the Stars
241
11.8 Dynamics, the Crowning Achievement
247
12 Coda
251
12.1 After the Great War
252
12.2 Reorganization of the Sterrewacht Leiden
255
12.3 Forty Years Professor and Seventieth Birthday
257
12.4 Kapteyn and Shapley
262
12.5 Retirement and Mount Wilson
264
12.6 The International Astronomical Union
267
12.7 The End
269
Appendix A: Some More Background
275
Appendix B: Literature
285
References
289
Index
297