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Phases of the Moon

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Phases of the Moon Created by Mrs. Bodine-Donahue The lunar month is the 28 days it takes to go from one new moon to the next. During the lunar month, the Moon goes ... – PowerPoint PPT presentation

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Title: Phases of the Moon


1
Phases of the Moon
Created by Mrs. Bodine-Donahue
2
  • The lunar month is the 28 days it takes to go
    from one new moon to the next. During the lunar
    month, the Moon goes through all its phases.

3
We only see the Moon because sunlight reflects
back to us from its surface.
4
  • During the course of a month, the Moon circles
    once around the Earth. If we could magically look
    down on our solar system, we would see that the
    half of the Moon facing the Sun is always lit.
    But the lit side does not always face the Earth!

5
  • As the Moon circles the Earth, the amount of the
    lit side we see changes. These changes are known
    as the phases of the Moon and it repeats in a
    certain way over and over.

6
Moon Phase Descriptions...

Although this cycle is a continuous process, there are eight distinct stages, called phases. These phases of the Moon, in the sequence of their occurrence (starting from New Moon), are shown below.

7
New Moon - The Moon's dark side is facing the
Earth. The Moon is not visible. 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 that we see looks very
dark.
8
  • Waxing Crescent Moon - As the Moon moves around
    the Earth, we get to see more and more of the
    illuminated half, and we say the Moon is waxing.
    At first we get a sliver of it, which grows as
    days go by. This phase is called the crescent
    moon.

9
  • Quarter Moon - A week after the new moon, when
    the Moon has completed about a quarter of its
    turn around the Earth, we can see half of the
    illuminated part that is, a quarter of the Moon.
    This is the first quarter phase.

10
  • Waxing Gibbous - The Moon appears to be more
    than one-half but not fully illuminated by direct
    sunlight. The fraction of the Moon's disk that is
    illuminated is increasing. This Moon can be seen
    after the First Quarter Moon, but before the Full
    Moon.  The amount of the Moon that we can see
    will grow larger and larger every day.  ("Waxing"
    means increasing, or growing larger.)

11
  • Full Moon - The Moon's illuminated side is
    facing the Earth. The Moon appears to be
    completely illuminated by direct sunlight. 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.

12
  • Waning Gibbous Moon - From now on, until it
    becomes new again, the illuminated part of the
    Moon that we can see decreases, and we say it's
    waning. The first week after full, it is called
    waning gibbous. The amount of the Moon that we
    can see will grow smaller and smaller every day.
    ("Waning" means decreasing, or growing smaller.)

13
  • Last Quarter - One-half of the Moon appears to
    be illuminated by direct sunlight. The fraction
    of the Moon's disk that is illuminated is
    decreasing. Sometimes called Third Quarter.  The
    left half of the Moon appears lighted, and the
    right side of the Moon appears dark.  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.

14
  • Waning Crescent - The Moon appears to be partly
    but less than one-half illuminated by direct
    sunlight. The fraction of the Moon's disk that is
    illuminated is decreasing. 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.

15
A while after four weeks the illuminated half of
the Moon again faces away from us, and we come
back to the beginning of the cycle a new moon.
16
Moon Phase Misconception...

"The most common incorrect reason given for the cause of the Moon's phases is that we are seeing the shadow of the Earth on the Moon! But this cannot be correct when the Moon passes through the shadow of the Earth, we get a lunar eclipse. Anyone who has seen a lunar eclipse, though, might remember that the Moon actually passes through the Earth's shadow only rarely, so that can't be why the Moon has phases. The real reason for the Moon's phases depends on two things the Moon is round, and the angle it makes with the Earth and Sun changes over its orbit."- As Quoted From Bad Astronomy
17
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