1. Rotation and Revolution

2. Solar System
A group of objects in space that move around a central star

3. Rotation The spinning of a planet on its axis
The Earth’s rotation takes about 24 hours or one day
Axis

4. Axis
An imaginary line that runs through both poles of a planet

5. Rotation Rotation causes the day and night cycle on Earth Night Day
Light From The Sun

6. Rotation
Rotation also causes the Sun and the stars to appear to move across the sky
Day
Night

7. This object just completed a revolution
The action of one object moving around another in an orbital path
This object just completed a revolution

8. Orbit The path an object takes as it revolves around a second object

9. Revolution
The Earth’s revolution takes about one year, or 365 days

10. Example - Revolution
The Earth revolves around the Sun
Earth
Sun

11. Example - Revolution
The Moon revolves around the Earth
Moon
Earth