Day and Night. 3.8C; 5.8C. Why do we only see the sun part of the time?. Sometimes we go outside and the sky is bright. We are able to see everything around us! Other times the sky is dark and it is hard to see across the street.
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The reason we can’t see the sun all the time is because the Earth is constantly rotating, or spinning, on its axis.
An axis is an imaginary line that goes through the Earth from the North Pole to the South Pole.
It takes the Earth 24 hours to make one rotation on its axis.
The side of the Earth facing the sun experiences daytime.
The side facing away from the sun has night.
Sunrise and sunset are part of the Earth’s day/night cycle.
The sun sets in the West.
The sun rises in the East.
That’s why the sun appears to move from East to West in the day sky!
The sun doesn’t really move—it just appears to because the Earth is moving!
12:00 p.m. or noon