The Moon - MR. TILLMAN MR. ANDERSON EARTH SCIENCE€¦ · The only "scientific instrument" you'll...
Transcript of The Moon - MR. TILLMAN MR. ANDERSON EARTH SCIENCE€¦ · The only "scientific instrument" you'll...
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The Moon
It's Just a Phase It's Going Through...
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It takes 29.5 days
for the Moon to
revolve around
the Earth and
we always see
one side of the
moon. (we
never see the
back side)
INTRODUCTION
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Moon
◼ Our planet's large natural satellite, the Moon, is the easiest astronomical object to observe.
◼ The only "scientific instrument" you'll need at first is a pair of eyes.
Picture from NASA
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The Moon's Orbit
◼ Rotation– Moon is spinning on its
axis
◼ Revolution– The moon orbits around
the Earth
– It takes the moon approximately one month to go around the Earth.
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Why do we never see the DARK SIDE?
◼ Synchronous Rotation is the reason we never see the dark side of the moon.
◼ Over the millennia, the Moon has become "locked" into a special kind of motion around the Earth.
◼ It rotates on its axis at the same pace as it revolves around the Earth
◼ As a result, the Moon keeps the same face toward us throughout its orbit.
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Phases
◼ The lighted side of the moon always faces
the sun.
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New Moon
◼ New moon occurs when the moon is between the sun & the Earth.
◼ The dark side of the moon is facing the Earth.
What we see
What is happening from above.
E
Sunlight
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Full Moon
◼ The full moon occurs when the Moon & the Sun are on opposite sides of the Earth.
◼ The lighted side of the moon is facing Earth.
What we see
What is happening from above.
E
Sunlight
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Full Moon◼ The full moon is given different names, depending on when it
appears. For example, the "Harvest moon" is the full moon that appears nearest to the Autumnal Equinox, occurring in late September or early October. Some other full moon names (by month) include
◼ January Moon After Yule, Wolf Moon, or Old Moon◼ February Snow Moon or Hunger Moon◼ March Sap Moon, Crow Moon, or Lenten Moon◼ April Grass Moon or Egg Moon◼ May Milk Moon or Planting Moon◼ June Rose Moon, Flower Moon, or Strawberry Moon◼ July Thunder Moon or Hay Moon◼ August Grain Moon or Green Corn Moon◼ September Fruit Moon or Harvest Moon◼ October Harvest Moon or Hunter's Moon◼ November Hunter's Moon or Frosty Moon, ◼ December Moon Before Yule or Long Night Moon.
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Blue Moon
◼ When there is more than one full moon in a month, the second moon is called a blue moon.
◼ A blue moon happens every two years on average.
◼ The phrase, “Once in a blue moon” means very rarely or very seldom or almost never.
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First QuarterMoon
◼ The First quarter moon occurs when the moon is halfway between new and full.
◼ As seen from the Earth, half the moon’s disk is illuminated.
What we see
What is happening from above.
E
Sunlight
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Third QuarterMoon
◼ The Third or last quarter moon occurs halfway between the full moon & the new moon.
◼ As seen from the Earth, half the moon’s disk is illuminated. What is happening from above.
E
Sunlight
What we see
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Waxing
◼ When the moon
is between new
& full, the visible
part of the moon
is increasing.
◼ This is called
waxing
E
Sunlight
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Waning
◼ When the moon
is between full &
new, the visible
part of the moon
is decreasing.
◼ This is called
waning.
E
Sunlight
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Waning
Crescent
Crescent Moon◼ When the moon
is between New
& 1st Quarter it is
called a waxing
crescent.
E
Sunlight
New Moon
Full Moon
1st Quarter3rd Quarter
Waxing
Crescent
❑ When the moon
is between 3rd &
New it is called a
waning crescent.
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Waning
Gibbous
Waning
Crescent
Gibbous Moon◼ When the moon
is between 1st
Quarter & Full it
is called a
waxing gibbous.
E
Sunlight
New Moon
Full Moon
1st Quarter3rd Quarter
Waxing
Crescent
❑ When the moon
is between Full &
3rd it is called a
waning gibbous.
Waning
Gibbous