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Moon Phases

Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

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Page 1: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Moon Phases

Page 2: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits

the Earth, we see different parts of the lighted area.

Page 3: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

The revolution of the Moon around the Earth makes the Moon look as if it is

changing shape in the sky. 

Page 4: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

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. 

Page 5: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

The Moon passes through eight major shapes (phases) during a cycle that repeats itself

every 29.5 days.  The phases always follow one another in the same order:

New Moon

Waxing Crescent

First Quarter

Waxing Gibbous

Full Moon

Waning Gibbous

Third (or Last) Quarter

Waning Crescent

Page 6: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Answer……February (only 28 or 29 days)

Question: Can you name the month that is not long enough for a complete lunar cycle?

Page 7: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

TerminatorThe line between the light and dark part of the moon.

The terminator moves left as each day passes!

Page 8: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

New Moon

The lighted side of the Moon faces away from the Earth.  This means that the Sun, Earth, and Moon are almost in a straight line, with the Moon in between the Sun and the Earth.  The Moon is not visible.

Page 9: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

New Moon

Page 10: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Crescent Moon

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

crescent will grow larger and larger every day as the terminator line moves left.

("Waxing" means increasing, or growing larger.)

Page 11: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Crescent Moon

http://www.air-and-space.com/Moon/20060927%20waxing%20crescent%20Moon%20l.jpg
Page 12: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

First Quarter Moon

The right half of the Moon appears lighted and the left side of the Moon appears dark. Although ½ of the Moon’s total

surface has sunlight shining on it, we can only see ½ of that area. That is why it is

called the first quarter and not the first half.

½ of ½ = ¼

Page 13: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

First Quarter Moon

Page 14: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Gibbous Moon

This Moon can be seen after the First Quarter Moon, but before the Full Moon.  The amount of the Moon that we can see continues to grow larger and larger every

day.

Page 15: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Gibbous Moon

Page 16: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Full Moon

The lighted side of the Moon faces the Earth.  This means that the Earth, Sun,

and Moon are nearly in a straight line, with the Earth in the middle.  The Moon that we

see is very bright from the sunlight reflecting off it.

Page 17: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Full Moon

Page 18: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Gibbous Moon

This Moon can be seen after the Full Moon, but before the Last Quarter Moon.  The illuminated part of the Moon that we can see becomes less

every day.

"Waning" means decreasing, or becoming less.

Page 19: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Gibbous Moon

Page 20: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Third Quarter Moon

Third or Last Quarter.  The left side of the Moon appears lighted, and the right side of

the Moon appears dark. This phase is also called the Last Quarter.

Page 21: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Third Quarter Moon

Page 22: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Crescent Moon

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 New Moon.

Page 23: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Crescent Moon

Page 24: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Summary….

• The Sun always shines on ½ of the Moon’s surface.• Phases are the result of seeing different amounts of the

illuminated surface as the Moon revolves around the Earth.• The full cycle of phases takes 29.5 days and then starts over.• The terminator line separating light from dark always moves to the left.• Waxing – Becoming more and more visible “Bright on the Right”• Waning - Becoming less and less visible “Light on the Left”• The phase looks the same from every location on Earth.• On one day every cycle, the Moon is not visible. (New Moon)• The moon does not make its own light, it reflects the Sun’s light.

Page 25: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing & Waning

Page 26: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we
Page 27: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Moon Movie

The movie is an animated GIF created by Antonio Cidadao from a sequence of still images taken during March and April 1998. Copyright Antonio Cidadao.

http://aa.usno.navy.mil/faq/docs/moon_phases.html

http://www.astrosurf.com/cidadao/
http://aa.usno.navy.mil/faq/docs/moon_phases.html
http://aa.usno.navy.mil/faq/docs/moon_phases.html
Page 28: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Name each phase in the following slides….

Begin

Page 29: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Gibbous Moon

Page 30: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

First Quarter Moon

Page 31: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Crescent Moon

Page 32: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Gibbous Moon

Page 33: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Crescent Moon

http://www.air-and-space.com/Moon/20060927%20waxing%20crescent%20Moon%20l.jpg
Page 34: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Full Moon

Page 35: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Third Quarter Moon

Page 36: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

New Moon

Page 37: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Crescent Moon

http://www.air-and-space.com/Moon/20060927%20waxing%20crescent%20Moon%20l.jpg
Page 38: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Gibbous Moon

Page 39: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Third Quarter Moon

Page 40: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waning Crescent Moon

Page 41: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

First Quarter Moon

Page 42: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Full Moon

Page 43: Moon Phases. The sun shines on ½ half of the Moon’s surface all the time. (The moon does not produce its own light!) As the Moon orbits the Earth, we

Waxing Gibbous Moon


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