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Tracking Changes
in Photoperiod Around
the Globe
Mystery Class Updates will be posted on Fridays:
Feb. 6, 13, 20, 27, Mar. 6, 13, 20, 27, Apr. 3, 10,
17, 24, May 1, 8
Mystery Class Update: February 13, 1998
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Mrs. Berger's 5th Grade Class |
From the bottom of our hearts, thanks go to Mrs.
Berger's class for providing this early Valentine's Day
gift containing
this week's set of sunrise/sunset data from our Mystery sites around the world. Her
class REALLY gets around!
Remember, this information was recorded on Monday, the same day you collected
your sunrise/sunset data. Don't forget to get up every Monday at sunrise! (Or find
your local sunrise/sunset data from your local newspaper.)
Here are this week's data:
Journey North Mystery Class
Sunrise/Sunset Data
Data For: Monday, February 9, 1998
Mystery Class
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Sunrise
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Sunset
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# 1
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7:23
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20:53
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# 2
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7:34
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17:50
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# 3
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0:00 *
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0:00 *
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# 4
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7:34
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17:42
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# 5
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6:35
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20:34
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# 6
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7:50
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17:39
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# 7
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6:59
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18:17
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# 8
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5:47
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18:33
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# 9
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7:17
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19:21
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# 10
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9:15
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15:39
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*Journey North Mystery Class #3 reported 00:00 for their times because,
right now, "the sun always shines!"
How To Organize Your Class
1. Divide Your Class into Eleven Groups
Give each group responsibility for one of the ten Mystery Classes, and give one additional
group responsibility for your own site. Every week, each group can record the data
and calculate the photoperiod for their site. Then, each group can share their calculations
with the rest of the class. Each individual student can add the information to his
or her own graph.
2. Give Each Group:
- One copy of the Mystery
Class Datasheet, to record sunrise/sunset times for each site(also found at page
98 of the Teacherís Manual.)
3. Make Your Own Mystery Class Graph
VERY IMPORTANT: In order for your graph to have enough room for a clear
picture of the data, we strongly recommend that your graph be tall enough to prevent
overcrowding!
Try This!
For a large classroom wall graph, we recommend the example of Wisconsin Third
Grade teacher and Mystery Class expert Cathie Plaehn:
Her class creates a huge 3 x 3 wall graph using butcher-block paper to plot the
mystery! Each student-group makes their own individual graphs, and the entire class
plots data on the wall graph.
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- If you have a Teacherís Manual, follow the instructions on pages 99-100.
- To make your own graph, use two pieces of 8 1/2 x 11 graph paper to allow at
least an inch per day-length hour. Then, follow these instructions for assembling
your graph:
A. Vertical Axis
Tape 2 graphs together, so the resulting graph is 22" tall. The left edge of
your graph (the 11" side, which is the vertical axis) will indicate day length
hours. Allow space for 20 day-length hours in total. At the lower left, begin with
4 hours of day length. Go up the vertical axis to 24 hours, and allow 4 squares for
each hour.
B. Horizontal Axis
The bottom of your graph (the 8 1/2 inch side, which is the horizontal axis), will
denote the dates of your Monday readings. Mark 11 weeks along the bottom, allowing
three squares per week. Write the following dates for your Monday readings along
the bottom of the graph:
Feb. 9, 16, 23
Mar. 2, 9, 16, 23, 30
Apr. 6, 13, 20
C. Example of a Mystery Class Graph: For guidance you can look at
a smaller one page example, or for a graph that can be used by each individual student,
look at the Mystery
Class Graph
The Next Mystery Class Update Will be Posted: February 20, 1998
Copyright 1998 Journey North. All Rights Reserved.
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