phases of the moon page 67 why does the moon appear to shine?
TRANSCRIPT
Phases of the Moon
Page 67
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!
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.
•The Moon’s orbit is a slightly tipped Ellipse (compared to the orbit of Earth around the sun.)
What is the orbit of the moon like?
What is a moon phase?
• Visible portion of the moon as seen from Earth.
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!
Waxing:
Waning:
Lit portion is increasing in size.
Lit portion is decreasing in size.
DreamWorX=WaXing
“Crescent”
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:
Phases of the Moon
Sunlight
Sunlight
(1) New Moon
(2)
Waxing Crescen
t (3) First Quarter
(4) Waxing Gibbous
(5) Full Moon
(6) Waning Gibbous
(7) Third Quarter
(8) Waning
Crescent
Earth
The general locations and
orientations for the phases of
the moon.
Earth spins on its axis in the
same direction as the moon’s
orbit.
Sunlight
Sunlight
Earth
(1) New Moon
How much of the moon’s face does the person see?
What time of day is it for the
observer?
Noon!!
NEW MOON Wherever the person
looks all they see is shadowed
moon.
Perspective & The Moon’s Face
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(2) Waxing Crescent
How much of the moon’s face does the person see?
What time of day is it for the
observer?
3PM!!
WAXING CRESCENT
When you look up you see only a small crescent
brightly lit. (Right Side)
Perspective & The Moon’s Face
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(3) First Quarter
How much of the moon’s face does the person see?
What time of day is it for the
observer?
Sunset - 6PM!!
FIRST QUARTER When you look up you see one half of the front
face of the Moon brightly lit. (Right side)
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(4) Waxing Gibbous
How much of the moon’s face does the person see?
What time of day is it for the
observer?
9PM!!
WAXING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on
the left.
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth(5) Full Moon
How much of the moon’s face does the person see?
What time of day is it for the
observer?
Midnight-12AM!!
FULL MOON When you look up you see the entire face of
the Moon brightly lit.
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(6) Waning Gibbous
How much of the moon’s face does the person see?
What time of day is it for the
observer?
3AM!!
WANING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on
the right.
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(7) Third Quarter
How much of the moon’s face does the person see?
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!!
Perspective & The Moon’s Face
Sunlight
Sunlight
Earth
(8) Wanin
g Cresce
nt
How much of the moon’s face does the person see?
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!!
