Tracking Changes
in Photoperiod Around
the Globe
Mystery Class Update: February 27, 1998
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Mrs. Berger's 5th Grade Class |
The sunrise and sunset data for this week's Mystery Class report are here! Thanks
to Mrs. Berger's class, for collecting
this information from points around the globe.
Remember, this information was recorded on Monday, the same day you collected
your sunrise/sunset data.
As you know, Journey North is about migration. Have you ever wondered why we are
also tracking changes in daylight? Over the next months, all the animals you track
and all the signs of spring you witness will be related to daylight in one way or
another. We hope you'll discover the many connections. This would be a good time
to look at the Seeing
the Light Lesson from the Teacher's Manual.
We also hope you'll answer Challenge Question #1 below!
First, try this:
- Select one of the Journey North migratory species.
- Find out where this animal fits in the food web. (What does this animal eat,
i.e.what is its prey? What is it's prey's prey? What plants does the prey eat?, etc.)
Go back through the food web until you reach the sun as the source of food energy
for this system.
- Draw a diagram of the food web.
- Next, think about ways this food web changes during the seasons.
- Now, see if you can answer:
Challenge Question #1:
"How do seasonal changes in photoperiod affect your animal's food web?"
(To respond to this Challenge Question, please follow the instructions at the
end of this report.)
Did You Know?
Speaking of changes in daylight, there was a full solar eclipse in the Caribbean
yesterday that stole about 3 minutes of daylight! In case you missed it, check out
these great Eclipse Websites, and also see if you can figure out why anyone would
bang pots and drums when an eclipse darkened the sky!
Exploratorium: Other
Ways to Think About an Eclipse
Exploratorium Eclipse
Eclipse '98
Curacao Eclipse
Here Are This Week's Data:
Journey North Mystery Class
Sunrise/Sunset Data
Data For: Monday, February 23, 1998
Mystery Class
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Sunrise
|
Sunset
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# 1
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6:35*
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19:38*
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# 2
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7:12
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18:09
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# 3
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4:06*
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23:56*
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# 4
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7:12
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18:02
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# 5
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6:54
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20:13
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# 6
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7:22
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17:57
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# 7
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6:50
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18:24
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# 8
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5:53
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18:25
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# 9
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7:16
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19:20
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# 10
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8:25
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17:00
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NOTES:
* A one hour adjustment has occurred in the times for MC #1 since last week,
but remember, this adjustment will NOT change the photoperiod. Due to daylight savings
time starting or ending in the coming weeks, you may see one hour changes at other
locations. Again, remember that these changes will not affect the photoperiod. The
sun stays up the same amount of time regardless of what time we say it is.
* Journey North Mystery Class #3: "Well it's finally happened. The
sun has set for the first time in 4 months... it was too late to stay up for."
How to Respond to Journey North Challenge Question #1:
1. Address an E-mail message to: jn-challenge-mclass@learner.org
2. In the Subject Line of the message write: Challenge Question #1
3. In the body of the message, give your school's name and location and answer this
question:
"How do seasonal changes in photoperiod affect your animal's food web?"
The Next Mystery Class Update Will be Posted: March 6, 1998
Copyright 1998 Journey North. All Rights Reserved.
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