A. The Planetary System -- Space and Time, Instruments -- A1. The Stars around the North Pole -- A2. Some Autumn Constellations -- A3. Spherical Triangles -- A4. Sun-Dials -- A5. The Daily Rotation of the Earth -- A6. Conversion of Time -- A7. Simple Measurements with an Altimeter -- A8. Eccentricity of Graduated Circles -- A9. The Adjustment of a Telescope -- A10. To point the Telescope to a Star -- A11. Fundamental Measurements with the Meridian Circle -- A12. Reduction to the Meridian -- A13. The Sextant -- A14. Finding your Position at Sea -- A15. Parallax as a Measure for Stellar Distances -- A16. Precession, Aberration, Nutation -- A17. The Measurement of Astrographic Plates -- A18. To grind a Telescope Mirror -- A19. Optics of a Small Telescope -- The Motions of Celestial Bodies -- A20. The Orbit of the Moon -- A21. The Orbit of the Moon from Ephemeris Data -- A22. Lunar Eclipses -- A23. The Position of the Planets in their Orbits -- A24. The Orbit of Mars, as determined by Kepler -- A25. Geocentric Coordinates of a Planet -- A26. The Three-Body Problem -- A27. The Orbit of a Meteor -- A28. Passage of an Artificial Satellite -- Planets and Satellites -- A29. Topography of the Moon -- A30. The Shape of Lunar Craters -- A31. Photographic Photometry of the Moon -- A32. Observation of Planets through a Telescope -- A33. The Albedo of Venus -- A34. The Rotation of Saturn -- B. The Stars -- The Sun -- B1. The Size of the Sun -- B2. The Solar Constant -- B3. The Brightness Distribution over the Sun's Disc -- B4. The Solar Spectrum -- B5. Profiles of Fraunhofer Lines -- B6. Profiles of Fraunhofer Lines (Correction and Interpretation) -- B7. Equivalent Width of Fraunhofer Lines -- B8. The Curve of Growth -- B9. Sunspots -- B10. The Rotation of the Sun -- B11. The Solar Cycle -- B12. The Convection Cells of Bénard -- B13. The Shape of the Corona -- B14. Radio Bursts after a Solar Flare -- The Stars -- B15. To draw a Constellation -- B16. The Apparent Magnitudes of the Stars -- B17. The Diameter of Stellar Images as a Measure for the Brightness -- B18. Photoelectric Photometry of Stellar Images -- B19. The Atmospheric Extinction -- B20. Stellar Spectra -- B21. The Colours of the Stars -- B22. The UBV Photometric System -- B23. Interstellar Extinction -- B24. The Nearest Stars -- B25. The Motion of the Hyades -- B26. The Mean Light Curve of a Cepheid -- B27. The Observation of Double Stars -- B28. The Orbit of a Visual Binary -- B29. The Dynamical Parallax of Binaries -- B30. The Orbit of a Spectroscopic Binary -- B31. The Orbit of an Eclipsing Variable -- B32. The Observation of Star Clusters and Nebulae -- B33. Open Clusters -- B34. The Distribution of the Stars in a Globular Cluster -- B35. Cluster Variables in a Globular Cluster -- B36. The Apex of the Solar Motion -- B37. Preferential Directions in the Stellar Motions -- B38. The Milky Way -- B39. Dark Nebulae -- B40. The Spiral Structure of the Galactic Clouds, derived from 21 cm Measurements -- Index of Subjects.