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Phases of the Moon

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Phases of the Moon. © 2004 Plano ISD, Plano, TX. Rotation . The moon also rotates. . What is the daily movement of the Earth called? . The moon rotates at the same rate it revolves. If we always see the same side, why does the moon look different during the month? .

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Presentation Transcript
slide1

Phases of the Moon

© 2004 Plano ISD, Plano, TX

slide2

Rotation

The moon also rotates.

What is the daily movement of the Earth called?

The moon rotates at the same rate it revolves.

If we always see the same side, why does the moon look different during the month?

Because of this, we never see the far side of the moon.

© 2004 Plano ISD, Plano, TX

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During a new moon the side of the moon facing the Earth is not reflecting any sunlight. It appears as if there is no moon at all.

The new moon occurs when the moon is between the Earth and the sun.

© 2004 Plano ISD, Plano, TX

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As the moon continues to travel along its orbit, we are able to see only a small portion of the moon. This is called a crescent moon.

Waxing means growing. Since the moon appears to be growing this phase is called waxing crescent.

© 2004 Plano ISD, Plano, TX

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As the moon continues to revolve around the Earth, we are able to view more of the lighted side of the moon.

© 2004 Plano ISD, Plano, TX

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In essence we are only seeing half of the lighted half of the moon.

Why is it called a quarter moon when it appears that we are seeing half the moon?

The next lunar phase is the firstquarter moon.

Remember we are not seeing the dark side of the moon.

Half of a half is a quarter!

1/2 X 1/2 = 1/4

© 2004 Plano ISD, Plano, TX

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As the moon begins to “grow” into a full circle it is called a waxing gibbous.

Do you remember what the word waxing meant?

The word gibbous means swollen on one side.

Waxing means growing!

© 2004 Plano ISD, Plano, TX

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The full moon is the next lunar phase.

© 2004 Plano ISD, Plano, TX

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When a full moon occurs, the Earth is between the sun and the moon.

During a full moon we see a complete circle in the sky, even though only half of the sphere is reflecting sunlight.

© 2004 Plano ISD, Plano, TX

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Swollen on one side.

What does gibbous mean?

The next phase is called waning gibbous.

Waning means shrinking.

During the waning gibbous phase the moon seems to be disappearing!

© 2004 Plano ISD, Plano, TX

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Why is it called a quarter?

Remember we are seeing half of a half or one quarter of the whole moon!

The last quarter is the next lunar phase.

© 2004 Plano ISD, Plano, TX

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How is the last quarter moon different from ...

They are mirror images of each other.

the first quarter moon?

© 2004 Plano ISD, Plano, TX

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Waning means shrinking.

You are seeing a smaller portion of the moon.

What do you think the next phase is?

The last phase is the waning crescent.

What does waning mean?

© 2004 Plano ISD, Plano, TX

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The new moon!

© 2004 Plano ISD, Plano, TX

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When two full moons occur in the same month, the second full moon is called a blue moon.

The moon is not really blue. Two full moons in one month rarely appear.

What is a blue moon?

© 2004 Plano ISD, Plano, TX

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