Jim Gilbert
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Tracking Changes in Photoperiod Around the Globe

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  • Challenge Question #2

    Fran Howley (grade5fh@pemetic.u98.k12.me.us)
    Mon, 17 Mar 1997 16:37:20 -0500 (EST)

    Happy Spring Equinox Journey North!!!!
    We have had quite a discussion up here in still icy, snowy Maine
    about the reasons that every one on planet earth will have 12 hours of
    daylight and 12 hours of dark on March 20th. We all agree that it has to
    do with the tilt of the earth's axis and the place that the earth is in
    its orbit around the sun. What has been hard for us to believe and
    remember is that it is not the tilt that changes - when we look at a
    model of the earth and sun we see the tilt is the same - what is
    different is the earth's place in its orbit around the sun. I'd really
    be interested in how others are learning about this concept.
    We also have a huge graph with all the mystery
    classes and it is quite obvious that all lines will meet at 12 hours on
    the 20th. Sarah made a very interesting observation. She said that the
    position of each of the classes on the graph was like looking at its
    location on the globe.
    From Grade 5 at Pemetic School in Southwest Harbor, Maine