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#1:
At
Hour
1,
what time of day do you think it is in your hometown?
Why?
Answer:
Use this question for pre-assessment. Have students discuss their
reasoning.
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#2:
How did the light change between Hour
1 and Hour
2? What does that "tell"
you?
Answer:
The daylight moved toward the West as the earth rotated. It must
be morning in most of the United States.
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#3:
What statement could you make on the basis of
this photo of Hour
7?
Answer:
All of North and South America are experiencing daylight. The
shadow (sunset) should appear on the right side of the photo (the
east). The sun appears to rise in the east. It was in the west
earlier, so sunrise should have appeared to move around the other
half of the earth. (It's actually the earth rotating, not the
sun!)
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#4:
What
change do you notice between Hour
7
and Hour
8?
How would you explain it?
Answer:
The shadow appeared on the right (east) side of the photo. It
is probably somewhere around noon in the continental United States.
(Note: The International Dateline, which runs longitudinally east
of Asia and Australia, is the arbitrary line that distinguishes
where one day ends and the next begins.)
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#5:
What
might you be doing this time of day
(Hour
11)?
Explain. What do you think someone in Europe might be doing this
time of day? Why?
Answer:
Students might say that they're eating dinner or getting ready
for bed. Someone in Europe is probably asleep already.
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#6:
From Hour
13, how many hours do you think
it will take the darkness to reach California?
Answer:
About two hours. We know that the continental U.S. has three time
zones. The sun has already set in the east, so it must have two
more time zones to go.
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#7:
The earth rotates on its axis once each day. Look at Hour
16 and consider: Which direction do you think it's
moving: from west to east or east to west? How can you tell?
Answer:
The earth rotates from west to east, which makes it seem as though
things in the sky (e.g., sun) move from east to west.
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#8:
Go back and forth between Hour
16 and Hour
17. Try imagining the earth rotating
in each direction. (Remember: The sun stays put!) How would the
sunlight and darkness change in each case?
Answer:
See above.
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#9:
What
might you be doing this time of day (Hour
24)?
Answer:
Students' answers will vary depending on where they live. They
may be about to get up for school or getting a couple more hours
of sleep!
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#10:
Now,
you've gone through a whole day and are back to where you started!
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