Jim Gilbert
Mystery Class Mystery Class

Tracking Changes in Photoperiod Around the Globe

  • Challenge Questions
  • Journey North News
  • Related Resources

    Today's News
    Today's News

    Migrations and Signs of Spring
    Migrations and
    Signs of Spring

    Report Your Sightings
    Report Your Sightings

    Teacher Discussion
    Teacher Discussion

    Search Journey North
    Search Journey North

    return to:
     JNorth Home Page

    A/CPB Home A/CPB


    • Mystery Class Update: February 28, 1997

    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:

    1. Select one of the Journey North migratory species.

    2. 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.

    3. Draw a diagram of the food web.

    4. Next, think about ways this food web changes during the seasons.

    5. Now, see if you can answer Challenge Question #1:

    "How do seasonal changes in photoperiod affect your animal's food web?"

    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 the question!

      We'll share your ideas and those of other students in future reports. You can also see students'answers to Challenge Questions on Journey North's WWW site.

      Journey North Mystery Class

      Sunrise/Sunset Data

      Data For: Monday, February 24, 1997

      Mystery Class Sunrise Sunset
      # 1 08:41 17:53
      # 2 09:23 17:59
      # 3 07:01 20:24
      # 4 05:41 17:53
      # 5 07:37 19:09
      # 6 04:13* * 00:02* *
      # 7 06:57 17:51
      # 8 05:57 18:45
      # 9 06:43 17:31
      # 10 06:58 19:36

      ** "Well it's finally happened. The sun has set for the first time in 4 months. of course a storm blew in and we were unable to see it due to visibility being about 1/2 mile. Plus it was too late to stay up for."

      The Next Mystery Class Update Will Be Posted On March 7, 1997