1. Rotation, Revolution, and the seasons
To change Fonts: go to Format - Replace Fonts – and then Replace: Mufferaw, With: Your Choice of Font then click replace fonts.

2. Rotation is spinning around an axis:
Image url: used with permission under GNU Free Documentation License.

3. Revolution is traveling in a circular (round) path:

4. Rotation and Revolution is exactly what happens to planets:
Our earth rotates once every day

5. And revolves once Every year around the sun

6. The sun and all the planets rotate
AND, the planets all revolve around the sun!

7. It can be dizzying!

8. Why do you think It gets cold in the winter?
What season is it in australia during december?
Why does it get cold in the winter? Don’t answer the question. See what they think and then say something like, “Well let’s find out.”
What season is it in Australia during December? Again, don’t answer it for the class, but the answer is Summer.

9. Seasons are caused by the earth’s tilt
23°
The earth’s rotation is tilted at 23°

10. So different parts of the earth don’t get as much sun as others
Sunlight
Answer: the southern (or lower) hemisphere
For more on how the earth is divided (hemispheres, equator, prime meridian, etc.) see
Equator
Which hemisphere gets more sun?

11. As the earth revolves around the sun, the tilt stays the same

12. Which hemisphere gets the most sunlight?
This means that the hemisphere that gets the most sunlight changes throughout the year
Equal
Southern
Northern
The answer to the question is in this order (will also appear on the slide, ask before you reveal the answer): southern, equal, northern, equal
Equal

13. Do you think it’s hotter or colder when we have more sunlight?
What season is it when it’s hotter?
When we have less sunlight, what season are we in?
Answer 1: Hotter
Answer 2: Summer
Answer 3: Winter
Answer 4: Fall or Spring
What season do you think we’re in if both hemispheres are getting the same amount of sunlight?

14. What season is the northern hemisphere experiencing?
spring
winter
Summer
Answers are provided on slide, (ask first!) in order: Winter, Spring, Summer, Fall
Fall

15. A common misconception is that the seasons are caused by the earth’s distance from the sun
Fall
summer
winter
spring

16. But During our winter, We’re actually closer to the sun than during the summer!
So seasons are caused by the earth’s tilt and the distribution of sunlight, not the distance fROm the sun

17. QUIZ!!!
Is the following rotation or revolution?

22. Cameron, I know more about mortal Kombat than you!! - Ms. O