1. Day and Night

2. The Earth The Earth rotates around the sun on an axis
It takes 24 hours to make one rotation

3. Rotation
When the Earth rotate on its axis, it causes day and night.

4. Watch About Night and Day
Tutorial:

5. Rotates and Revolves The Earth rotates on its axis
This causes ______ and ________.
The Earth also revolves around the sun
Watch it:

6. Revolves
The Earth rotates on its axis and at the same time revolves around the sun.
When the Earth goes around the sun on its axis, is tilts.
This tilt cause the seasons.

7. How long is one rotation?
This trip takes 365 ¼ days (1 year)
Every four years we have a leap year and add one day to the calendar in February.
When you add up each quarter day you get one whole day (4 quarters = 1 whole)

8. Revolves vs. Rotates

10. Summer
When the Northern Hemisphere tilts towards the sun we have summer.
What season does the summer hemisphere have?

11. Winter
When the axis tilts the Northern Hemisphere away from the sun, we have Winter.
What season is it in the Southern Hemisphere?