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The Planetary System.- The Stars Around the North Pole.- Spherical Triangles.- Sun-Dials.- The Daily Rotation of the Earth.- Conversion of Time.- Simple Measurements with an Altimeter.- The Adjustment of a Telescope.- To Point the Telescope to a Star.- The Sextant.- Finding Your Position at Sea.- Precession, Aberration, Nutation.- Lunar Eclipses.- The Position of the Planets in their Orbits.- The Orbit of Mars, as Determined by Kepler.- The Three-Body Problem.- Atmospheric Trajectory of a Meteoroid.- Passage of an Artificial Satellite.- Position of a Geostationary Satellite.- Topography of the Moon.- The Shape of Lunar Craters.- Observation of Planets Through a Telescope.- The Rotation of Saturn.- The Stars.- Solar Quantities.- The Size of the Sun (S).- The Solar Constant (S).- The Brightness Distribution over the Sun's Disc (L).- Profiles of Fraunhofer Lines (L).- Equivalent Width of Fraunhofer Lines (L).- The Curve of Growth (L).- Practice with MHD.- Sunspots(S).- The Rotation of the Sun(L).- The Solar Cycle (L).- The Convection Cells of Benard (L).- Radio Bursts after a Solar Flare (L).- To Draw a Constellation (S).- The Apparent Magnitudes of the Stars (S).- Photoelectric Photometry of Stellar Images (L).- The Atmospheric Extinction (S).- Stellar Spectra (L).- Data Retrieval in Spectroscopy.- The Colours of the Stars (L).- The UBV Photometric System (L).- Black Body Radiation.- Combinations of Black Bodies.- Spectrophotometry of Stars in the Near Infrared.- Derivation of Illuminations from Stellar Colors.- Interstellar Extinction (L).- Interstellar Extinction II.- Temperatures of Stars: Wavelength Dependent Interstellar Extinction.- The Nearest Stars (L).- Stars at the Galactic Centre.- The Motion of the Hyades (L).- The Mean Light Curve of a Cepheid (L).- Search and Determination of Periodicity.- Properties of Pulsars and the Interstellar Medium.- Mirages Caused by a Gravitational Lens.- Forbidden Emission Lines - I.- Forbidden Emission Lines - II.- Abundance of Elements.- The Observation of Double Stars (S).- The Orbit of a Visual Binary (L).- The Dynamical Parallax of Binaries (L).- The Orbit of a Spectroscopic Binary (L).- The Orbit of an Eclipsing Variable (L).- Light Changes of Eclipsing Variables and what we can Learn from them.- The Observation of Star Clusters and Nebulae (S).- Open Clusters (L).- The Distribution of the Stars in a Globular Cluster (L).- Cluster Variables in a Globular Cluster (L).- The Milky Way (S).- The Spiral Structure of the Galactic Clouds, Derived from 21 cm Measurements (L).- Stability of Molecular Clouds.- The High Redshift of Quasars.