1. Rotate or Revolve?
GLE Explain how the positional relationships among the earth, moon, and sun control the length of the day, lunar cycle, and year.

2. Lesson Objective
What is the difference between rotate and revolve?

3. Question to Ponder
How does the Earth move?

4. Definitions Rotate- to spin
Revolve- to go around another object or orbit

5. Rotate Think of the Earth rotating like a...
A child’s toy – A spinning top

6. Rotate
The Earth spins or rotates on its axis
Tilted at 23.5 Degrees

7. How Fast?
One
rotation
takes 24hrs

8. What is the Result? What happens when the Earth rotates?

9. Fill in the Blank
A complete rotation of the Earth results in _________________________.

10. Revolve Think of the Earth revolving like...

11. Revolve
The Earth revolves around its star.

12. How Fast?
Earth revolves around the sun in 365 days, 5 hours, 59 minutes and 16 seconds
The moon revolves around the Earth in 27.3 days

13. What is the Result?
What happens when the Earth revolves around the Sun?
What about the moon revolving around the Earth?

14. Fill in the Blank
A complete revolution of the Earth around the Sun results in _____________.
A complete revolution of the Moon around the Earth results in _______________.

15. What objects revolve in space?
Satellites revolve around the Earth (GPS)
Space station revolves around the Earth
Moons revolve around their planets
Planets revolve around their star
The four gas planets have rings that revolve around them

16. Lesson Summary What is the definition of rotate?
Give an example of an object that rotates
What is the effect of the Earth rotating?
What is the definition of revolve?
Give an example of an object that revolves
What is the effect of the Earth revolving?

17. Lesson Assessment
Label each statement as Rotate or Revolve