JANICE VANCLEAVE is a former award-winning science teacher who now spends her time writing and giving science workshops. She is the author of over 40 books with sales totaling over 2 million copies.

• Introduction. PART I. MEASUREMENTS. Apparent Diameter: Observed. Angular Separation: Angular Distance Between Celestial Bodies. Altitude: Vertical Coordinate. Azimuth: Horizontal Coordinate. PART II. OPTICAL INSTRUMENTS. Apertures: The Gathering of Light. Diffraction: The Spreading of Light. PART III. THE SUN. Sunspots: Cooler Surface Regions. True Sun: How the Sun Appears to Move. Seasons: Four Times of the Year. PART IV. THE PLANETS. Solar System Scale: Miniature Model. Barycenter: The Balancing Point. Orbital Eccentricity: How Circular a Celestial Body's Path Is. Planetary Phenomean: Planetary Movement Relative to Earth. Orbital Period: Time of Revolution. Spheroids: Bulging Bodies. Rotation: The Spinning of Celestial Bodies. Phases of Venus: Changes in Shape and Size. PART V. MOONS. Moon Phase: The Moon's Visible Lighted Surface. Eclipses: Shadows of the Earth and Moon. Craters, Maria, and Highlands: The Moon's Surface Features. Galilean Satellites: Jupiters Largest Moons. PART VI. STARS. Celestial Sphere: Sky Globe. Zodiac Band: Background for the Ecliptic. Cirumpolar: Stars above the Horizon. Star Clock: Star Positions Indicate Time. Star Systems: Multiple Stars. Apparent Magnitude: Apparent Star Brightness. Parallax: Apparent Shift of an Object. PART VII. METEORS AND ARTIFICIAL SATELLITES. Meteors: Streaks of Light in the Sky. Artificial Satellites: Man-Made Orbiters. Appendix 1: Random Error of Measurements. Appendix 2: Relative Error: Percentage Error. Appendix 3: Planet Facts and Figures. Appendix 4: Tangent Table. Appendix 5: Sources of Scientific Supplies. Glossary. Index.

JANICE VANCLEAVE is a former award-winning science teacher who now spends her time writing and giving science workshops. She is the author of over 40 books with sales totaling over 2 million copies.

• Introduction. PART I. MEASUREMENTS. Apparent Diameter: Observed. Angular Separation: Angular Distance Between Celestial Bodies. Altitude: Vertical Coordinate. Azimuth: Horizontal Coordinate. PART II. OPTICAL INSTRUMENTS. Apertures: The Gathering of Light. Diffraction: The Spreading of Light. PART III. THE SUN. Sunspots: Cooler Surface Regions. True Sun: How the Sun Appears to Move. Seasons: Four Times of the Year. PART IV. THE PLANETS. Solar System Scale: Miniature Model. Barycenter: The Balancing Point. Orbital Eccentricity: How Circular a Celestial Body's Path Is. Planetary Phenomean: Planetary Movement Relative to Earth. Orbital Period: Time of Revolution. Spheroids: Bulging Bodies. Rotation: The Spinning of Celestial Bodies. Phases of Venus: Changes in Shape and Size. PART V. MOONS. Moon Phase: The Moon's Visible Lighted Surface. Eclipses: Shadows of the Earth and Moon. Craters, Maria, and Highlands: The Moon's Surface Features. Galilean Satellites: Jupiters Largest Moons. PART VI. STARS. Celestial Sphere: Sky Globe. Zodiac Band: Background for the Ecliptic. Cirumpolar: Stars above the Horizon. Star Clock: Star Positions Indicate Time. Star Systems: Multiple Stars. Apparent Magnitude: Apparent Star Brightness. Parallax: Apparent Shift of an Object. PART VII. METEORS AND ARTIFICIAL SATELLITES. Meteors: Streaks of Light in the Sky. Artificial Satellites: Man-Made Orbiters. Appendix 1: Random Error of Measurements. Appendix 2: Relative Error: Percentage Error. Appendix 3: Planet Facts and Figures. Appendix 4: Tangent Table. Appendix 5: Sources of Scientific Supplies. Glossary. Index.