How Does the Earth Move

1
How Does the Earth Move?
2
Like this satellite, the Earth is constant moving
around the Sun. The path that an object takes
around an other, larger object is called an orbit.
What is this satellite doing?
Every 3651/4 days the Earth makes a complete trip
around the sun.
3
NO?
Ok try this
Can you see the axis that the Earth is spinning
on?
4
While the earth is orbiting the sun it is also
spinning around on its own. This is called a
rotation, or one full spin, on its axis.
The axis is an imaginary line by which something
spins.
5

• Imagine if we could stretch out our planet in to
  a Octahedron look how it spins on its vertex

6
Notice how again it spins on its vertex the same
thing happens with the Earth
7
Now can you see the axis that the Earth is
spinning on?
8
The rotation of the Earth on its axis gives us
our seasons.

• Our seasons occur as a result of the uneven
  heating of our planet by the sun. Watch how the
  light of the sun travels across our planet over
  the course of a year.

9
(No Transcript)
10
When the Sun shines on the Earth like this, what
season is it in the northern hemisphere?
Thats right its Summer Time!
11
The more light an area receives from the sun, the
more heat that area will receive.
12
This is known as the Solstice.

• In the northern hemisphere this is the longest
  day of the year and it marks the beginning of the
  summer or the Summer Solstice. (June 22)
  
• But this is the shortest day of the year and the
  beginning of winter for the southern hemisphere.
  This is the Winter Solstice. (December 22)

13
Look at this model of the earth and the sun. Can
you tell me where the Earth is during the summer
for the Northern Hemisphere?
14
Thats right its point B!! But how can the sun
be further away from the sun during the summer
and closer during the winter?
15
Because the area of the planet that gets the
light from the sun, also gets the heat from the
sun.
16
When the Sun shines on the Earth like this what
season is it, in the northern hemisphere?

• Correct again, it is the Spring, or Fall.
• At this point during the year the North and South
  Poles both are getting equal light.
  
• There will be 12 hours of light, and 12 hours of
  darkness.

17
This is called the Equinox.

• If the days are getting longer, then this would
  be the Vernal Equinox, or the first day of
  Spring
  
• If the days are getting shorter, then this would
  be the Autumnal Equinox, or the first day of fall.

18
Equinox is a Latin word.

• Equi is Latin for Equal.
• Nox is Latin for night.
• Equal night Equinox

19
POP QUIZ Turn your worksheet over and complete th
e quiz.
20
Youll have 5 minutes to answer these questions

• What is the difference between an Equinox and a
  Solstice?

• What causes the change of seasons here on Earth?

21
3-4) If the Earth is orbiting the sun in
alphabetical order, what point is the spring, and
what point is the fall equinox?
22
Answers

• What is the difference between an Equinox and a
  Solstice?

Solstice is the longest and shortest days of the
year and the equinox has 12 hours of light and
dark

• What causes the change of seasons here on Earth?

The axial tilt of the planet, or the axis
23
A is the winter solstice as the northern pole is
pointed away from the sun. That being said, B is
the Spring and D is the Fall.
24
Homework Due Next Class

• Enter Assignment here

25
(No Transcript)
26

• Additional Images from
• http//www.seds.org/nineplanets/nineplanets/
• Used with permission
• And
• www.Animationfactory.com

27
Teacher Lecture Notes
28
Usage Information
This Power Point has been designed to correlate
with the Fourth Grade Georgia Professional
Standards or GPS for the 2006 2007 School year.
Any Teacher using this Power Point for
educational purposes may do so with out worry of
monetary reimbursement, and with my full
blessing. (We have to buy enough stuff already
?) I would appreciate that the credit be given
to any and all participants in the making of this
power point. I hope you use them well and enjoy
them with your students. If you have any
suggestions or comments regarding this or any of
my Power Point Presentations please email me at
David.Eichler_at_Cobbk12.org. Anyone using this
Power Point outside of the classroom, for
personal gain, or profit will need to get my
personal approval, in writing. I have put 100s
of hours into the production of these
presentations over the years, and I have created
for the students in our classrooms, not to get
rich, for fortune, or fame. I hope that you do
not take advantage of this work for personal
gain.Please do not make changes to this Power
Point other then the correction of a grammatical,
or punctuation error.