Phases of the Moon Page 59 How far

Phases of the Moon Page 59

How far away is the MOON? • 380, 000 km (abou 239, 000 miles)

The moon is about 1/6 the size and mass, and has approximately 1/6 the gravity of Earth.

What is a SATELLITE? • A natural or man made object that revolves around a planet • (A natural satellite is a MOON)

What is the moon doing out in space? • Revolving around the Earth in a counterclockwise direction • Rotating on its axis as it goes around the Earth

Where did the Moon come from?

Giant Impact Theory • Earth struck by large body, size of Mars. • Part of body + Earth flung into space. • Captured by gravity of Earth. • Reformed into sphere

Why does the moon appear to shine?

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.

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. )

What is a moon phase? • Different shapes visible portion of the moon makes 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!

1. 2. 3. 4. New Moon Waxing Crescent First Quarter Waxing Gibbous 5. 6. 7. 8. Full Moon Waning Gibbous Third Quarter Waning Crescent Waxing: Lit portion is increasing in size. Waning: Lit portion is decreasing in size.

Dream. Wor. X= Wa. Xing

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

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t NEW MOON Wherever the person looks all they see is shadowed moon. Earth (1) New Moon What time of day is it for the observer? Noon!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t WAXING CRESCENT When you look up you see only a small crescent brightly lit. (Right Side) Earth (2) Waxing Crescent What time of day is it for the observer? 3 PM!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t Earth Sunligh t FIRST QUARTER When you look up you see one half of the front face of the Moon brightly lit. (Right side) (3) First Quarter What time of day is it for the observer? Sunset - 6 PM!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t Earth Sunligh t WAXING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on the left. (4) Waxing Gibbous What time of day is it for the observer? 9 PM!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t Earth (5) Full Moon Sunligh t 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-12 AM!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? Sunligh t (6) Waning Gibbous Earth Sunligh t 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? 3 AM!!

Perspective & The Moon’s Face (7) Third Quarter How much of the moon’s face does the person see? Sunligh t THIRD QUARTER When you look up you see one half of the front face of the Moon brightly lit. (Left side) Earth What time of day is it for the observer? Sunrise - 6 AM!!

Perspective & The Moon’s Face How much of the moon’s face does the person see? (8) Waning Crescent Sunligh t WANING CRESCENT When you look up you see only a small crescent brightly lit. (Left Side) Earth What time of day is it for the observer? 9 AM!!