# Aim: Does the moon actually change shape?. Earth was hit by the impactors too but we have weather, water, erosion, plants, plate tectonics that changes.

## Presentation on theme: "Aim: Does the moon actually change shape?. Earth was hit by the impactors too but we have weather, water, erosion, plants, plate tectonics that changes."— Presentation transcript:

Aim: Does the moon actually change shape?

Earth was hit by the impactors too but we have weather, water, erosion, plants, plate tectonics that changes our surface. The moon does not have an atmosphere or water so its surface stays the same.

The apparent daily motion of the moon is from east to west. As the moon makes one revolution around the Earth, it also makes one rotation on its axis. This is why we always see the same side of the moon (the same side of the moon is always facing the Earth)

Sidereal Month – It takes the moon 27 1/3 days to complete one revolution (orbit) around the Earth. Synodic Month – The time required for the moon to complete a cycle of phases is 29 ½ days.

The word month comes from moonth since people used celestial observations for time.

What have you noticed about the moon over a monthly cycle?  The moon seems to change its shape!

The amount of lighted side we can see from earth varies as the moon revolves around us during one month in a cyclic pattern.

The moon is always half lit and half dark – every round object in space is! From Earth, we only see a portion of the lit side

Rotation Period = 27.3 days Revolution Period = 27.3 days Moon shows the same “face” to the Earth Velocity = 360  /27.3 days = 13  per day

New moon – the entire lit portion of the moon is facing AWAY from the earth; no light visible Full moon – the entire lit portion of the moon is facing TOWARD the earth

Waxing: the RIGHT portion of the moon seems to GROW. Waning: the LEFT portion of the moon seems to SHRINK

Waxing phases are when the amount of lighted side we see increases each night First light on right – from new to full Waning phases are when the amount of lighted side we see decreases each night Last light left – from full to new

Crescent Moons – phases where you can see less than half of the bright side Gibbous Moons – phases where you can see more than half of the bright side

Phases of the Moon Sunlight (1) New Moon (2) Waxing Crescent (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 Earth (1) New Moon How much of the moon ’ s face does the person see? What time of day is it for the observer? NEW MOON Wherever the person looks all they see is shadowed moon. What part of the moon will we see? Noon!!

More phases 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? WAXING CRESCENT When you look up you see only a small crescent brightly lit. (Right Side) 3PM!!

The next phase… 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? FIRST QUARTER When you look up you see one half of the front face of the Moon brightly lit. (Right side) Sunset - 6PM!!

And the next phase… 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? WAXING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on the left. 9PM!!

It ’ s becoming clear… 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? FULL MOON When you look up you see the entire face of the Moon brightly lit. Midnight-12AM!!

Hey, what ’ s happening… 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? WANING GIBBOUS When you look up you see only a small crescent, darkly shadowed, on the right. 3AM!!

I’m melting…I mean shrinking… 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!!

Soon I’ll be gone… Sunlight Earth (8) Waning Crescent 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!!

Aim: How does the movement of our moon affect us?

Solar Eclipses – the sun is blocked from view The moon gets between sun and earth The sun’s light is completely blocked by the moon Can only happen during new moon phase but not every time, because moon’s orbit is tilted

Solar Eclipse Animation

Partial Eclipse Animation

The next total solar eclipse in New York will be 8/21/2017 Mark your calendars now!!!

Lunar Eclipses – the moon is blocked from view Occurs when full moon passes into Earth’s shadow and is temporarily blocked from view.

Sunlight is bent around Earth through our atmosphere. Mainly red light reaches the moon, so the totally eclipsed moon appears to have a reddish color.

About 7 eclipses during every year The orbit of the moon is not in the same plane as the orbit of Earth around the sun The moon’s orbit is tilted 5° to Earth’s orbit This is why we do not have total eclipses so frequently

Moon may appear larger when closer

Gravitational attraction pulls on Earth’s water creating a cycle of high and low tides

During the new moon and the full moon Earth, the sun, and the moon are aligned The combined gravitational pull of the sun and the moon results in higher high tides and lower low tides The daily tidal range is greatest during the new and full moon periods

During the first-quarter moon and third-quarter moon Earth, the sun, and the moon are at right angles The combined gravitational pull of the sun and the moon work against each other The daily tidal range is small during this period

Every day cycle because earth rotates into and out of high water

Spring Tide NOT the Season !!! Highest high tide when sun-earth-moon aligned During full and new moon positions only Neap Tide Lowest high tide when sun-earth-moon at right angles During quarter phases only

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