1. To Do Today: Students will be able to…
Discuss the motions of the earth and define reference lines.
Discuss properties of the sun.

2. Motions of Earth & reference lines
Day & Night Cause:
Rotation – the spinning of the earth on its axis.

3. Motions of Earth & reference lines
Axis – is an imaginary line through the poles of earth.
Rotation of the Earth takes 24 hours or 1 day in a west to east direction.

4. Motions of Earth & reference lines
This makes the sun, moon, & stars, appear to rise in the east and set in west.
½ Earth has day, ½ has night.

5. Motions of Earth & reference lines
How we know the earth rotates:
Motion of sun, moon, stars
Pendulum changes direction slowly

6. Motions of Earth & reference lines
Missiles flying a straight path across earth seem to curve
Bulge at equator
Space flight has proved it.

7. Motions of Earth & reference lines
Special Lines Equator – imaginary line halfway between north and south pole. Latitude – lines measure N and S. 0° to +/- 90 °

8. Motions of Earth & reference lines
Longitude – lines measure E and W. 0° to 180° east and west Prime meridian - 0° longitude line that runs through Greenwich, England

9. Time to rotate into a worksheet