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How
is Sunlight Changing?
Mornings in North America
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Shadows
Change, Too!
Are your students measuring the length of an object's shadow at
the same time each week or month? They should notice that the shadow
appears longer each week as the sun appears lower in the sky. (The
most direct rays are hitting the Earth at more of an angle.) |
If your
students are tracking sunrise and sunset times, they may have noticed
these things:
Why
does all this matter?
All seasonal changes – temperature, plant growth and life cycles,
animal migrations, and so on – are driven by shifts in the amount
of available sunlight (called daylength or photoperiod) and its intensity
(related to the angle at which it strikes the Earth). For
more information on changing sunlight, go here:
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