1. Warm Up – Page 184 Why do we have days? Why do we have years?

2. As the World Turns How does our journey through space cause days, years, and seasons?

3. Earth rotates on its axis once every 24 hours. We call this one day. When your part of the earth faces the sun, you experience day. What happens to cause night? Rotation

4. East West Sun appears to rise in the east and set in the west because the Earth turns on its axis from west to east.

5. Revolution The path the Earth takes around the sun is called it’s revolution. It takes us 365.24 days to travel around the sun. We revolve around the sun counterclockwise. http://members.shaw.ca/len92/earth_revolution.gif

9. Observing Solstices The Summer and Winter Solstices have been important to mankind for a long time. Stonehenge is aligned to measure the solstices.

10. Vernal Equinox in March and the Autumnal Equinox in September; Equinox means “equal night”. These were considered the two days of the year where daylight and nigh time hours were equal. Now refers to the days the center of the sun is directly above the equator. Equinoxes

12. Many people believe we have summer because we are closer to the sun in the summer. Look at the diagram and explain why they are wrong!

13. Questions?