Earth

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Earth in Space
Earth's Motion and Seasons
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• People once thought the Earth was

flat

• Today we know its shape is a

Sphere
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Earths Location

• Earth is located in a collection of stars called
  a

Galaxy

• The kind of galaxy is called a spiral galaxy and
  Earth is located on one of the arms.

• The name of the galaxy that Earth is located in
  is the

Milky Way
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Solar System

• The Earth is the 3rd planet of nine planets that
  revolves around the sun.

The Earths orbit is the curved path it follows
as it travels around the sun.
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Earths Travels

• People once believed everything traveled around
  the Earth.

• Now we know it is the Earth that moves. It both
  rotates and revolves.

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• The spinning of the Earth on its axis which
  causes day and night is called

Rotation

• The motion of the Earth around the sun which
  takes about 365 ¼ days or one year to complete is
  called a

Revolution
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Figure the Speed

• The moon is 240,000 miles from of the Earth and
  it travels around the Earth once every 27 days.
  How fast is it traveling?
• ? x diameter circumference

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The Earths Tilt

• The Earth has 4 seasons. Summer, Spring, Autumn,
  and Winter.

• These seasons are caused by Earths

Tilt
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• The Earths axis is the imaginary line around
  which the Earth spins (rotates) causing the Earth
  to tilt toward and away from the sun during
  different times of the year.

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• The seasons depend on which side of Earth is
  tilted toward the sun.

• When the Northern Hemisphere is tilted toward the
  sun it is summer in the north and winter in the
  south and vice versa.

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Day vs. Night

• During the summer the number of hours of daylight
  is longer and the number of hours of darkness is
  shorter.

• During the winter it is just the opposite.
  Longer nights and shorter days.

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Solstices

• The solstices are the longest and shortest days
  of the year.

• The Summer Solstice is the longest and the winter
  solstice is the shortest.

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Northern Hemisphere

• During the Summer Solstice, the Earth is tilted
  as far toward the Sun as possible.

• During the Winter Solstice, the Earth is tilted
  as far away from the Sun as possible.

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Winter Solstice for Northern Hemisphere
Summer Solstice for Southern Hemisphere
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Summer Solstice for Northern Hemisphere
Winter Solstice for Southern Hemisphere
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Equinoxes

• During the Equinoxes the Earth is neither
  pointing toward or away from the Sun.

• During the Spring and Fall equinox the length of
  day versus night is equal.

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Moon Phases

• The phase of the moon you see depends on how much
  of the sunlit side of the moon faces Earth

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Moon Phases
Waxing Gibbous
Waxing Crescent
1st Quarter
New Moon
Waning Crescent
Waning Gibbous
3rd Quarter
Full Moon
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Moon Phases
The shadow on the moon always disappears from
right to left when the moon is growing. If you
can see the right side of the moon, then it is
growing.
The moon always disappear from left to right as
well. So if you can see the left side then it is
getting smaller.
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What phase?
3rd Quarter
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• When the moon grows it is said to be

Waxing

• When the moon gets smaller it is said to be

Waning