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

2. 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
South
West 
 East
Sun
Leo
Cancer
Gemini
Taurus
Aries
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3. At what time will Star B be located high in the Northwestern sky?
North
North Star
6 PM
Celestial Sphere Rotation
Celestial Sphere
Path of Star A
Path of Star B 1 3 4 2
Earth’s Equator
Horizon
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. 
North
North Star
6 PM
Celestial Sphere Rotation
Celestial Sphere
Path of Star A
Path of Star B 1 3 4 2
Earth’s Equator
Horizon
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. How can we describe the motion of the sun in the sky?
meridian
Zenith or overhead X
east
south
west

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

8. Where is the Sun at noon today?
zenith
here or there?
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. Where is the Sun throughout the year?
June 21 Summer Solstice
Mar 21 (Vernal) and Sept 21 (Autumnal) Equinox
zenith
Dec 21 Winter Solstice
east
south
west

12. ONE YEAR zenith east south west
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
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18. If you are located in the continental U. S
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.
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19. For an observer in the continental U. S
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? x
NORTH
SOUTH
WEST
Shadow
plot A
plot C
plot B
EAST
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.
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