Saturday, October 6, 2012
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Thursday, October 4, 2012
DAY & NIGHT
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Why do we have day and
night?
We have day and night because the Earth rotates. It spins on
its axis, which is an imaginary line passing through the North and South
Poles.
The Earth spins slowly all the time, but we don't feel any
movement because it turns smoothly and at the same speed.
How long does it take
the Earth to turn around?
The Earth takes a whole day (24 hours) to makea complete turn.
Why is the Sun in the sky at some times and not at other
times?
At any time half of the Earth faces the sun. This part has
day. The other half of the Earth faces away from the Sun. It receives no
light. It is dark and has night.
The sun is the source of light for day.
 Why does the sun seem
to move across the sky?
The Sun does not move. It seems to move across the sky
starting in the east in the morning, moving toward the south at noon, and
then toward the west as the day ends.
It is the Earth turning that makes it seem as though the Sun
is moving.
Day Length
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