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Looking Up Illustrations #1 Northen Circumpolar Constellations #2 Ursa Major #3 M3I & Perseus #4 Summer Triangle #5 Taurus #6 Orion #7 Sagittarius #8 Centaurus and Crux, The Southern Cross #9 Southern Circumpolar Constellations About the Authors Preface Approach New to the Fifth Edition Features of this Book For the Instructor Acknowledgements PART 1 THE COSMIC LANDSCAPE Unit 1 Our Planetary Neighborhood 1.1 Earth 1.2 The Moon 1.3 The Planets 1.4 The Sun 1.5 The Solar System 1.6 The Astronomical Unit Unit 2 Beyond the Solar System 2.1 Stellar Evolution 2.2 The Light-Year 2.3 The Milky Way Galaxy 2.4 Galaxy Clusters and Beyond 2.5 The Still-Unknown Universe Unit 3 Astronomical Numbers 3.1 The Metric System 3.2 Scientific Notation 3.3 Special Units 3.4 Approximation Unit 4 Scientific Foundations of Astronomy 4.1 The Scientific Method 4.2 The Nature of Matter 4.3 The Four Fundamental Forces 4.4 The Elementary Particles Unit 5 The Night Sky 5.1 The Celestial Sphere 5.2 Constellations 5.3 Daily Motion 5.4 Latitude and Longitude 5.5 Celestial Coordinates Unit 6 The year 6.1 Annual motion of the sun 6.2 The Ecliptic and the Zodiac 6.3 The Seasons 6.4 The Ecliptic's Tilt 6.5 Solstices and Equinoxes 6.6 Precession Unit 7 The Time of Day 7.1 The Day 7.2 Length of Daylight Hours 7.3 Time Zones 7.4 Daylight Saving Time 7.5 Leap Seconds Unit 8 Lunar Cycles 8.1 Phases of the Moon 8.2 Eclipses 8.3 Eclipse Seasons 8.4 Moon Lore Unit 9 Calendars 9.1 The Week 9.2 The Month 9.3 The Roman Calendar 9.4 The Leap Year 9.5 The Chronicling of Years Unit 10 Geometry of the Earth, Moon, and Sun 10.1 The Shape of Earth 10.2 Distance and Size of the Sun and Moon 10.3 The Size of Earth 10.4 Measuring the Diameter of Astronomical Objects 10.5 The Moon Illusion Unit 11 Planets: The Wandering Stars 11.1 Motions of the Planets 11.2 Early Ideas About Retrograde Motion 11.3 The Heliocentric Model 11.4 The Copernican Revolution Unit 12 The Beginnings of Modern Astronomy 12.1 Precision Astronomical Measurements 12.2 The Nature of Planetary Orbits 12.3 The First Telescopic Observations Unit 13 Observing the Sky 13.1 Learning the Constellations 13.2 Motions of the Stars 13.3 Motion of the Sun 13.4 Motions of the Moon and Planets 13.5 A Sundial: Orbital Effects on the Day PART 2 PROBING MATTER, LIGHT, AND THEIR INTERACTIONS PART 3 THE SOLAR SYSTEM PART 4 STARS AND STELLAR EVOLUTION PART 5 GALAXIES AND THE UNIVERSE Appendix Answers to Test Yourself Questions Glossary Credits Index ±à¼­ÊÖ¼Ç Í¼Æ¬ÉùÃ÷