1. Sun-Earth-Moon System

2. Day and Night
Day and Night

3. Day and Night
Day and Night

4. Q: Imagine what would happen if Earth’s rotation is slowed by 2x → 48 hours a day
Warmer in the day
Colder at night
Different daily habits → may take nap in the day and work longer at night

5. Comets
Comets

6. Earth nearest to Sun – Jan 3rd
Earth farthest from Sun – July 4th
Q: Does this elliptical orbit cause seasonal temperatures on Earth?
A: No. If it did, you would expect the warmest days to be in Jan. This is not true in the northern hemisphere.

7. The Seasons
The Seasons

8. Seasons
Seasons

9. Seasons
Seasons

11. Dark Side of the Moon If the Earth were the Sun…
1. How long would the Moon’s year be?
2. How long would a Moon day be?
3. How does this effect the living conditions on the Moon?
4. Where would you rather live: dark side or visible side?

12. Keywords
Solstice
Equinox
Axis
Tilt
Rotation
Revolution

13. Activity: Observing the Moon
Sun = Lamp
Earth = Head
Moon = Ping Pong Ball
Rotate to your left (counter-clockwise)

16. Phases of the Moon
Phases of the Moon

17. Phases of the Moon
Phases of the Moon

19. Eclipses

20. The Moon’s Origin
Impact theory