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# Day and Night - PowerPoint PPT Presentation

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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Presentation Transcript

### Day and Night

3.8C; 5.8C

• 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.

• What makes this difference? Why is the sky bright some of the time and dark the rest of the time?

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.

Day and Night its axis?

It takes the Earth 24 hours to make one rotation on its axis.

Day and Night axis.

The side of the Earth facing the sun experiences daytime.

The side facing away from the sun has night.

Day and Night axis.

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!

Day and Night axis.

The sun doesn’t really move—it just appears to because the Earth is moving!

7:00 a.m.

8:00 a.m.

9:00 a.m.

11:00 a.m.

12:00 p.m. or noon