Units 1. Telescopes 2. The Night Sky 3. Star Magnitudes and Stellar Parallax 4. The Message of Starlight 5. The HR Diagram 6. Stellar Life Cycles 7. Galaxies and the Universe 8. Measuring the Sky 9. Greek Models of the Heavens 11. A Sun-Centered Universe 12. Founders of a Science 13. The Search for the Outer Planets 14. Evolution of the Solar System 15. Space Debris: Asteroids, Meteors, and Comets Appendices A. Scales B. Changing Faces of the Moon C. TheSun D. Planetary Data E. Properties ofthe Thirty Nearest Stars F. Properties of tlie Twenty Brightest Stars G. SkyMaps Activities 1. Designing an Observatory 2. Lenses and Telescopes 3. Star Charts 4. Trigonometric Parallax 5. Stellar Spectra Classification 6. HRDiagrams 7. Spectroscopic Parallax 8. Stellar Evolution 9. Galaxy Classification 10. Hubble's Law 11. Distances to the Moon and Sun 12. Tracing Epicycles 13. Determining the Orbit of Mars 14. The Phases of Venus 15. Mapping the Solar System From Earth 16. Moon Phases