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OF THE EARTH
Darken a room, turn on a slide projector, and slowly rotate a globe of the earth counterclockwise in the light beam. The turning of the earth is called rotation. One complete rotation takes twenty-four hours (one complete day).
how the eastern portion of the United States
the direction of rotation and comparing the
Back to reality! Place a piece of metal windowscreen into a 2 inch by 2 inch slide frame and project it onto a globe of the earth. The projector represents the sun and the globe presents the earth in its summer position.
You will see that the squares of the grid elongate toward the top and bottom of the globe.
model, you should be able to realize that the
a square piece of paper the size of one square of
tilted axis continually points 23 1/2 degrees in one direction throughout
its revolution. One revolution
of the year can be compared, as can other
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