The System of the Stars

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  1. The Task of Sidereal Astronomy
  2. The Methods of Sidereal Research
  3. The Stars as Suns
  4. The Chemistry of Red Stars
  5. Gaseous Stars and Nebulæ
  6. The Temperatures of the Stars
  7. Temporary Stars
  8. Stars Variable in Long Periods and Irregularly
  9. Variable Stars of Short Period
  10. The Colours of the Stars
  11. Double Stars
  12. Stellar Orbits
  13. Variable Double Stars
  14. Spectroscopic Binaries
  15. Multiple Stars
  16. The Evolution of Multiple Stars
  17. The Pleiades
  18. Star Clusters
  19. The Forms of Nebulæ
  20. The Great Nebulæ
  21. The Nature and Changes of Nebulæ
  22. The Distances of the Stars
  23. Translation of the Solar System
  24. The Proper Motions of the Stars
  25. The Milky Way
  26. Status of the Nebulæ
  27. The Construction of the Heavens

This work was published before January 1, 1924, and is in the public domain worldwide because the author died at least 100 years ago.