3.3.2 Star Tracks SUMMARY This nonfiction book provides information about constellations and celestial navigation and shows how scientists explain and study nature. The book gives a history of how sailors navigated by the stars, leading to the invention of the telescope. Students are also introduced to important astronomers such as Galileo, Sir Isaac Newton, and George Hale, the inventor of the Hubble telescope. celestial navigation dead reckoning latitude quadrant telescope INTRODUCE THE BOOK INTRODUCE THE TITLE AND AUTHOR Introduce students to the title and the author of Star Tracks. Based on the title, ask students what kind of information they think this book will provide. Ask: Are you familiar with the instrument the girl on the cover photograph is using? How does the title of the book give you clues to what she is doing? BUILD BACKGROUND Ask students if they have ever looked through a telescope or seen any of the photographs from the Hubble telescope. Then discuss with students if they and their family have ever gotten lost and what signposts they might have looked for to help them find their way. Tell students that by reading this book, they can find out about how people navigate using the stars. PREVIEW/USE ILLUSTRATIONS Suggest students skim the text and look at the illustrations and captions. Ask: What clues do these text elements give as to what this book might be about? 56 READ THE BOOK SET PURPOSE Have students set a purpose for reading Star Tracks. Students’ interest and curiosity about stars and celestial navigation can guide this purpose. As students read, suggest they take down notes that might provide answers to any questions they might have about the subject. STRATEGY SUPPORT: SUMMARIZE To give LESSON VOCABULARY astronomers constellations galaxy light-year refractive AUTHOR’S PURPOSE SUMMARIZE students more support in summarizing, ask them to summarize the previous school year or their summer vacation. Remind students that as they read