1. What causes the phases of the moon?
Sun
Earth
Moon

2. When you observe a crescent moon in the evening, do the tips point left or right?
Facing South
sun
West

3. Can a full moon rise at midnight?
Sun
No!
New Moon
Half Moon
Earth
Full Moon

5. Moon phases The lighted side of the Moon faces away from Earth.
How the moon appears to Earth dwellers at different positions in its orbit is shown below:

6. On the scale of the earth as a 10” globe, how far is the moon, sun, etc.?
25 feet
Sun:
1.9 miles
Pluto:
73 miles
Alpha Centauri:
500,000 miles
Space Shuttle:
0.25 inch

7. What causes an eclipse?
Sun
Solar Eclipse
Earth
Lunar Eclipse

8. The lunar cycle An eclipse is when light is obscured by an object.
The Sun-facing side of the Moon is lit by sunlight almost all the time.

10. Solar eclipses
A solar eclipse occurs when the Moon’s shadow falls on Earth.

11. Why do we always see the same face of the moon?
Earth
Moon

12. What causes the tides?
Sun
Moon
Earth
Moon

13. Tides
The daily cycle of rising and falling ocean levels is called a tide.

14. Where is the center-of-mass of the earth+moon?
R = 0.75R e
Earth

15. Spring tides
The gravity from the Sun can work with the Moon to create unusually high and low tides.
Unusually high and low tides are called spring tides.

16. Where is the center-of-mass of the sun+earth?
R = R s
Sun

17. What does the orbit of the moon around the sun look like?

18. Neap tides
Neap tides occur when there is unusually little difference between high and low tides