1. Phases of the Moon
Page 67

3. Why does the moon appear to shine?

8. It is reflecting light from the sun.
Why does the moon appear to shine?
It is reflecting light from the sun.
Only the side of the moon facing the sun lights up!
Half of the moon is always lit up.
We don’t always see the side that is lit!

9. Why do we always see the same face/side of the moon?
(“the man on the moon”)
The moon completes one rotation (spin) in the same time it takes to revolve around the Earth.

13. What is the orbit of the moon like?
The Moon’s orbit is a slightly tipped Ellipse (compared to the orbit of Earth around the sun.)

15. Visible portion of the moon as seen from Earth.
What is a moon phase?
Visible portion of the moon as seen from Earth.

16. How long does it take for the moon to go through all of it’s phases?
29.5 days, or about a month!
Tip-think of it as a moonth!

17. Lit portion is increasing in size. Lit portion is decreasing in size.
New Moon
Full Moon
Waxing Crescent
Waning Gibbous
First Quarter
Third Quarter
Waxing Gibbous
Waning Crescent
Waxing:
Waning:
Lit portion is increasing in size.
Lit portion is decreasing in size.

18. DreamWorX= WaXing

19. “Crescent”

20. Try it!
Try to draw a model of where the moon would need to be, relative to the Sun and Earth, in order to see each phase:

22. Phases of the Moon Sunlight Sunlight Earth
The general locations and orientations for the phases of the moon.
(7) Third Quarter
(6) Waning Gibbous
(8) Waning Crescent
Sunlight
Earth
(1) New Moon
(5) Full Moon
Sunlight
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Earth spins on its axis in the same direction as the moon’s orbit.
(2) Waxing Crescent
(4) Waxing Gibbous
(3) First Quarter

23. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(1) New Moon
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NEW MOON Wherever the person looks all they see is shadowed moon.
What time of day is it for the observer?
Noon!!

24. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(2) Waxing Crescent
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WAXING CRESCENT When you look up you see only a small crescent brightly lit. (Right Side)
What time of day is it for the observer?
3PM!!

25. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(3) First Quarter
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FIRST QUARTER When you look up you see one half of the front face of the Moon brightly lit. (Right side)
What time of day is it for the observer?
Sunset - 6PM!!

26. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(4) Waxing Gibbous
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WAXING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on the left.
What time of day is it for the observer?
9PM!!

27. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(5) Full Moon
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FULL MOON When you look up you see the entire face of the Moon brightly lit.
What time of day is it for the observer?
Midnight-12AM!!

28. Perspective & The Moon’s Face
How much of the moon’s face does the person see?
Sunlight
Earth
(6) Waning Gibbous
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WANING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on the right.
What time of day is it for the observer?
3AM!!

29. Perspective & The Moon’s Face
Sunlight
Earth
(7) Third Quarter
How much of the moon’s face does the person see?
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THIRD QUARTER When you look up you see one half of the front face of the Moon brightly lit. (Left side)
What time of day is it for the observer?
Sunrise - 6AM!!

30. Perspective & The Moon’s Face
Sunlight
Earth
(8) Waning Crescent
How much of the moon’s face does the person see?
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WANING CRESCENT When you look up you see only a small crescent brightly lit. (Left Side)
What time of day is it for the observer?
9AM!!