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Practice Problems on Motion - Celestial Sphere, Sun's Motion

Solve practice problems on motion related to the celestial sphere and the sun's motion. Explore the position and direction of stars and the sun at different times of the day and year.

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Practice Problems on Motion - Celestial Sphere, Sun's Motion

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  1. Practice Problems on “Motion” – available on D2L

  2. Sun Gemini Taurus Leo Cancer Aries  East West  South If you could see stars during the day, the drawing below shows what the sky would look like at noon on a given day. The Sun is near the stars of the constellation Gemini. Near which constellation would you have expect the Sun to be located at sunrise on this day? • Leo • Cancer • Gemini • Taurus • Aries 0/0

  3. Celestial Sphere Rotation  Path of Star B Celestial Sphere 1 Path of Star A 4 North Star 2   3 North Star Earth’s Equator Horizon 6 PM  Celestial Sphere Rotation North At what time will Star B be located high in the Northwestern sky? • 4:00 am • 10:00 am • 2:00 pm • 7:00 pm • 1:00 am

  4. Celestial Sphere Rotation  Path of Star B Celestial Sphere 1 Path of Star A 4 North Star 2   3 North Star Earth’s Equator Horizon 6 PM  Celestial Sphere Rotation North If you were able to see the motion of star B be at Noon, over a period of 15 minutes what direction would it appear to move? • west (to the left) • east (to the right) • South (out of the page) • away from the horizon (up) • toward the horizon (down)

  5. The changing position of the Sun during the year!

  6. meridian X Zenith or overhead east south west How can we describe the motion of the sun in the sky?

  7. How can we describe the motion of the sun in the sky? meridian zenith LUNCH!! PM or post meridian AM or ante meridian east south west

  8. hereorthere? Where is the Sun at noon today? zenith east south west

  9. Where is the Sun at noon today? zenith What about tomorrow at noon? there east south west

  10. What about the path of the Sun? zenith What about tomorrow at noon? JUST A LITTLE LOWER !! there east south west

  11. June 21 Summer Solstice Mar 21 (Vernal) and Sept 21 (Autumnal) Equinox Dec 21 Winter Solstice Where is the Sun throughout the year? zenith east south west

  12. The time for the sun to go from being highest in the sky at noon, to lowest and back to highest again is… ONE YEAR zenith east south west

  13. Where would the Sun be on your birthday?

  14. Position of the Sun when photographed during the day of the winter and summer solstice

  15. Altitude of the Sun Animation • Note where the sun rises and sets • Note how the altitude of the sun changes during a day and over the course of the year. • Note how the shadow changes during a day and over the course of the year.

  16. Tutorial: Path of the Sun – p.17 • Work with a partner! • Read the instructions and questions carefully. • Discuss the concepts and your answers with one another. • Come to a consensus answer you both agree on. • If you get stuck or are not sure of your answer, ask another group. • If you get really stuck or don’t understand what the Lecture Tutorial is asking, ask one of us for help.

  17. Under which of the following circumstances will a vertical flagpole not cast a shadow as seen from the continental United States? • every day at noon • every day at the time when the sun is highest in the sky • when the sun is highest in the sky on the summer solstice • when the sun is highest in the sky on the winter solstice • none of the above 0/0

  18. If you are located in the continental U.S. on the first day of October, how will the position of the Sun at noon be different two weeks later? • It will have moved toward the north. • It will have moved to a position higher in the sky. • It will stay in the same position. • It will have moved to a position closer to the horizon. • It will have moved toward the west. 0/0

  19. NORTH x x Shadow plot A x x x x x Shadow plot B x x x x x x WEST EAST x x x x x x x x x Shadow plot C SOUTH For an observer in the continental U.S., which of the three shadow plots, shown at right, correctly depicts the Sun’s motion for one day? • Shadow plot A • Shadow plot B • Shadow plot C • More than one of the plots are possible, on different days of the year. • None of the plots are possible. 0/0

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