1. THIS PRESENTAION HAS BEEN RATED BY THE CLASSIFICATION AND RATING ADMINISTRATION TG-13 TEACHERS’ GUIDANCE STRONGLY ADVISED Some Material May Be Unintelligible For Students Under 13. Intense Frames of Scientific Instruction, Analysis, Comparing and Contrasting, Description, and for Some Vocabulary. © 1852 All Rights Reserved VOID WHERE PROHIBITED BY LAW

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3. ASTRONOMY The Night Time Sky The Celestial Sphere

4. OBJECTIVES By the end of this presentation, students will be able to… List two reasons for the importance of recognizing the constellations or their asterisms.

5. As navigational aides, the locations of these constellations depend on the location of the observer. - Due to the earth spinning from west to east, all stars, planets, the moon and the sun rise in the east and set in the west. - The farther west the observer, the later the sun, moon and stars rise.

6. As navigational aides, the locations of these constellations depend on the location of the observer. - Due to the curvature of the earth, the farther north the observer, the closer to the zenith circle the circumpolar stars. - The farther north the observer, the closer to the southern horizon the equatorial stars move.

7. East o o + + West o

8. + East o o West o +

9. As navigational aides, the locations of these constellations depend on the location of the observer. - Due to the curvature of the earth, the farther south the observer, the closer to the north horizon circle the circumpolar stars. - The farther south the observer, the equatorial stars rise in the east, transit closer to the zenith, and set in the west.

10. East o o + + West o

11. East o o + + West o

12. Recognizing these constellations from their asterisms, navigators of old were able to estimate their location on the earth. Today, recognizing these constellations from their asterisms, casual observers will be able to locate celestial objects (stars, planets, etc.) in the nighttime sky. -- Circumpolar Constellations -- Zodiac Constellations -- Equatorial Constellations.

13. ASTRONOMY The Night Time Sky The Celestial Sphere