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3.3.2 Star Tracks AUTHOR’S PURPOSE SUMMARIZE SUMMARY This nonfiction book provides R EAD TH E BOO K information about constellations and celestial SET PURPOSE Have students set a purpose for navigation and shows how scientists explain reading Star Tracks. Students’ interest and and study nature. The book gives a history of curiosity about stars and celestial navigation how sailors navigated by the stars, leading can guide this purpose. As students read, to the invention of the telescope. Students suggest they take down notes that might are also introduced to important astronomers provide answers to any questions they might such as Galileo, Sir Isaac Newton, and George have about the subject. Hale, the inventor of the Hubble telescope. STRATEGY SUPPORT: SUMMARIZE To give LESSON VOCABULARY students more support in summarizing, ask astronomers celestial navigation them to summarize the previous school year constellations dead reckoning or their summer vacation. Remind students galaxy latitude that as they read, they can take notes that light-year quadrant summarize what they are reading and give refractive telescope clues to the author’s purpose in writing the story. INTRO D UCE TH E BOO K COMPREHENSION QUESTIONS INTRODUCE THE TITLE AND AUTHOR Introduce PAGE 7 Why is the North Star so important students to the title and the author of Star for celestial navigation? (It is always found by Tracks. Based on the title, ask students looking north.) what kind of information they think this book will provide. Ask: Are you familiar with the PAGES 10–11 Summarize how early explorers instrument the girl on the cover photograph used the stars to navigate. (Early explorers is using? How does the title of the book give depended on the sun and on the stars. Then you clues to what she is doing? they used dead reckoning to measure their course.) BUILD BACKGROUND Ask students if they have ever looked through a telescope or seen PAGE 13 Summarize why it’s difficult to depend any of the photographs from the Hubble on the quadrant to navigate. (The North Star telescope. Then discuss with students if they is sometimes hidden by clouds; the horizon can and their family have ever gotten lost and be difficult to find in the dark; ocean waves what signposts they might have looked for to make it difficult to hold a quadrant steady.) help them find their way. Tell students that by What do you think the author’s reading this book, they can find out about how PAGE 16 people navigate using the stars. purpose is in telling you that Galileo was not at first believed? (to express the notion that PREVIEW/USE ILLUSTRATIONS Suggest students because people do not believe something does skim the text and look at the illustrations not mean that it is not true) and captions. Ask: What clues do these text elements give as to what this book might be about? 56 Star Tracks
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