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2
5
Attach Handout on
Understanding the Seasons.
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The
seasons are the result of the __TILT__ of the Earth's axis.
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The
imaginary line around which the Earh rotates is the __AXIS__.
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The angle
of the Earth's tilted axis is __23 1/2__ degress from its orbit around the Sun
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At the same
time the Earth is rotating, it is traveling around the Sun. One complete orbit of the Earth around the Sun is called
a __REVOULTION__.
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As the Earth
revolves around the Sun, its axis always __POINTS TO SAME PLACE, THE NORTH STAR__.
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If the axis
of the Earth was not tilted but perpendicular to its orbit, a person standing at the same location would NEVER or ALWAYS
see a change in the noontime altitude of the Sun and the seasons.
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Hold a flashlight
at various angles to a wall, keeping the distance of the beam to the wall the same. In order to make the light fall
over the smallest area, how must the beam be directed toward the wall? __PERPENDICULAR TO THE WALL__.
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The smaller
the angle of the beam striking the wall, the LARGER or SMALLER the area will be illuminated.
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The energy
source of the flashlight is the same, no matter how the beam is directed toward the wall. But the energy falling upon
the wall per unit area varies due to the __ANGLE__ at which the beam hits the wall.
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The same
can be said for the angle at which the Sun's energy strikes the Earth. The angle of the sunlight striking the Earth's
surface depends on the Earth's __TILTED AXIS__.
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