Moon Phases 1. Define - PowerPoint Presentation

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Moon

Phases

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1. Define

Rotation:

The Spinning of Earth on its axis. Earth rotates once every 24 hours.

2. Define

Revolution:

The movement of the Earth around the Sun. It takes the Earth 1 year to complete a revolution.

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3

. What is an

orbit

?

Orbit: The path the earth follows as it revolves around the sun. (Also known as a trajectory.)Helpful Hint: Earth’s orbit is an ellipse, or a slightly elongated circle.Picture

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4

. Why does the moon shine?

The moon reflects the light of the Sun.

Reflection:

Light from the sun bounces off the moon’s surface.Helpful Hint: A mirror reflects an image because light bounces off of it surface.Picture:

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5

. Half of the Moon is always lit up by the sun. As the Moon orbits the Earth, we see different parts of the lighted area.

http://www.nasm.si.edu/apollo30th/moontheater/phasepage2.html

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6

. The revolution of the Moon around the Earth makes the Moon look as if it is changing shape in the sky. But the moon never changes its shape.

http://btc.montana.edu/ceres/html/birthdayphases.htm

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7

. This is caused by the different angles from which we see the lighted part of the Moon's surface.  These are called "

phases

" of the Moon. 

http://btc.montana.edu/ceres/html/birthdayphases.htm

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8

. Phases of the Moon

Phases of the Moon:

different angles from which we see the lighted part of the Moon's surface.

Helpful Hint: There are 8 different phases.Picture:

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http://www.niehs.nih.gov/kids/lunar/why_phases.gif

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7. The Moon passes through

eight

phases during a cycle that repeats itself approximately every 27 days.  The phases always follow one another in the same order:

New moon

Waxing CrescentFirst quarterWaxing GibbousFull Moon

Waning Gibbous

Last Quarter

Waning Crescent

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8. New Moon

The lighted side of the Moon faces away from the Earth.  The moon is almost directly between the sun and Earth. 

Start of the Moon Cycle.

Looks very dark, so we often see nothing in the sky.

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New Moon

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9. Waxing Crescent Moon

This Moon can be seen after the New Moon, but before the First Quarter Moon. 

A bit of the sunlit side of the moon shows.

The crescent will grow larger and larger every day, until the Moon looks like the First Quarter Moon.

("Waxing" means increasing, or growing larger.) - Vocab. Sheet

http://btc.montana.edu/ceres/html/birthdayphases.html

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Waxing Crescent Moon

http://btc.montana.edu/ceres/html/birthdayphases.html

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10. First Quarter Moon

The moon is a quarter of its way around earth. It is in its first quarter.

The right half of the Moon appears lighted and the left side of the Moon appears dark. 

During the time between the New Moon and the First Quarter Moon, the part of the Moon that appears lighted gets larger and larger every day, and will continue to grow until the Full Moon.

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First Quarter Moon

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11. Waxing Gibbous Moon

The moon is waxing, which means increasing , or growing larger.

Moon can be seen after the First Quarter Moon, but before the Full Moon.

Gibbous means: Greater than half, but not full. 

The amount of the Moon that we can see will grow larger and larger every day.  ("Waxing" means increasing, or growing larger.)

http://btc.montana.edu/ceres/html/birthdayphases.html

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Waxing Gibbous Moon

http://btc.montana.edu/ceres/html/birthdayphases.html

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12. Full Moon

Two weeks have passed since the new moon. The entire face of the moon we see shines.

The lighted side of the Moon faces the Earth. 

The Moon that we see is very bright from the sunlight reflecting off it.

This means that the Earth, Sun, and Moon are nearly in a straight line, with the Earth in the middle. 

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Full Moon

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13. Waning Gibbous Moon

This Moon can be seen after the Full Moon, but before the Last Quarter Moon. 

Gibbous means more than half, but not full.

The amount of the Moon that we can see will grow smaller and smaller every day. ("Waning" means decreasing, or growing smaller.)

http://btc.montana.edu/ceres/html/birthdayphases.html

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Waning Gibbous Moon

http://btc.montana.edu/ceres/html/birthdayphases.html

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14. Last Quarter Moon

Sometimes called Third Quarter. 

The left half of the Moon appears lighted, and the right side of the Moon appears dark. 

The moon is three-quarters of its way around the Earth.

It is in its last quarter phase.During the time between the Full Moon and the Last Quarter Moon, the part of the Moon that appears lighted gets smaller and smaller every day. It will continue to shrink until the New Moon, when the cycle starts all over again.

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Last (Third) Quarter Moon

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15. Waning Crescent Moon

A bit of the waning sunlit side of the moon shows.

("Waning" means decreasing, or growing smaller.)

This Moon can be seen after the Last Quarter Moon and before the New Moon.  The crescent will grow smaller and smaller every day, until the Moon looks like the New Moon.

http://btc.montana.edu/ceres/html/birthdayphases.html

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Waning Crescent Moon

http://btc.montana.edu/ceres/html/birthdayphases.html

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http://www.opencourse.info/astronomy/introduction/04.motion_moon/moon_phases.gif

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The moon takes

approximately

27

days

to orbit Earth.

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Waxing & Waning

http://www.nasm.si.edu/apollo30th/moontheater/phasepage4.html

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16. Tips to Remember

Waxing

and

Waning

Flatten your right hand, with your fingers together and your thumb sticking out. Hold your hand out at arm’s length in front of you. Tilt your thumb towards the ground.See how the line along your thumb and first finger makes a curve, roughly like a

backwards

letter “‘C’”? It actually looks sort of like this: ) This is the shape of the Waxing Moon. If the Moon’s curve fits along this right-hand curve, it is a Waxing Moon.

Commit it to memory. One way to remember this is to think of drawing in wax. Most people are right-handed, and if they were to draw in wax, they’d use their right hand. So if the Moon fits in your right-hand curve, it is

waxing

.

Say: “Wax on”

Do the same with the left hand. This makes a shape like this:  (
This is the shape of the Waning Moon. If the moon fits in this curve, you know it is getting smaller every day, going toward the new moon / dark moon.

Say: “Wane Off”

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http://www.nasm.si.edu/apollo30th/moontheater/phasepage4.html

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http://www.calvin.edu/~lmolnar/moon/images/phases.gif

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Moon Movie

http://

www.learn360.com/ShowVideo.aspx?lid=6818736&SearchText=moon+phases&ID=139913

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MOON QUIZ!!

http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/moonlight.html