Lunar Cycle

1
Lunar Cycle

• Goal Identify the phases of the Moon, and
• relate the phases to eclipses.

2
Memory Devices

• White on the right, growing bright!
• White on the left, losing light!

3
Memory Devices

• Wax on increasing light!
• Just as a candle wick is dipped in wax, and the
  candle wax increases the size of the candle.
• Wane off decreasing light!
• Gibbous bulge

4
Memory Devices

• New Moon Near the Sun
• Full Moon Far from Sun
• Remember, YOU are on the EARTH looking at the
  Moon.

5
New Moon

• The new moon phase occurs when the Moon is
  between the Sun and the Earth.
• When this occurs, there is a possibility of
  having a solar eclipse.
• Solar eclipses do not happen each month because
  the orbit of the Moon is in a different plane of
  orbit than the Earth.

6
Waxing Crescent

• The Moon revolves around the Earth.
• Waxing means to increase in size. This refers to
  the lit portion of the Moon.
• Crescent refers to the shape.

7
First Quarter

• When the Moon has gone one fourth of the way
  around the Earth, it is called the first quarter.
• From our point of view, the right half of the
  Moon is lit.

8
Waxing Gibbous

• The gibbous phase looks like a fat football.
• The word gibbous means bulging.
• During the waxing gibbous phase, the lit side of
  the Moon continues to grow in size.

9
Full Moon

• During the full moon, we see the light reflecting
  from the entire surface of the Moon facing the
  Earth.
• During this phase, it is possible to have a lunar
  eclipse.

10
Waning Gibbous

• Waning means to decrease in size.
• During the waning phase of the Moon, the lit
  portion decreases in size.
• The waning gibbous occurs after the full moon.

11
Third Quarter

• The third quarter has the lit side on the left.
• The Moon is three fourths of the way around its
  orbit.

12
Waning Crescent

• The waning crescent gets smaller and smaller,
  until the Moon completes its orbit and begins a
  new cycle with another new moon.

13
Solar Eclipse

• The Moon moves directly between the Sun and
  Earth. The Moon casts a shadow on the Earth this
  only occurs with a new moon.
• This does not occur with every new moon due to
  the Moon being in a different plane of orbit of
  than the Earth.

14
Lunar Eclipse

• The Earth, Sun, and Moon are directly lined up in
  the center. The Earth casts a shadow on the Moon
  this only occurs with a full moon.
• This does not occur with every full moon due to
  the Moon being in a different plane of orbit of
  than the Earth.
• .

15
Memory Devices

• White on the right, growing bright!
• White on the left, losing light!

16
Memory Devices

• Wax on increasing light!
• Just as a candle wick is dipped in wax, and the
  candle wax increases the size of the candle.
• Wane off decreasing light!
• Gibbous bulge

17
Memory Devices

• New Moon Near the Sun
• Full Moon Far from Sun
• Remember, YOU are on the EARTH looking at the
  Moon.

18
ReviewWhat phase is this? Be prepared to Justify
your answer.

• First Quarter

19
What phase?What phase would be next?

• New Moon
• Waxing Crescent

20
What phase?What phase would be next?

• Waning Gibbous
• Third Quarter

21
What phase?What phase would be next?

• Full Moon
• Waning Gibbous

22
What phase?What phase would be next?

• Waxing Crescent
• First Quarter

23
What type of eclipse could occur during this
phase?

• Lunar Eclipse

24
What phase?What phase would be next?

• First Quarter
• Waxing Gibbous

25
What phase?What phase would be next?

• Waning Crescent
• New Moon

26
A View From Outer Space
What is different from our view on Earth?
27
Waxing Crescent
Waning Crescent
New Moon
First Quarter
Last Quarter
Full Moon
Waxing Gibbous
Waning Gibbous