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Solar Motion

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Earth, Moon & Sun System - Bowling Green High School ... Solar Motion – PowerPoint PPT presentation

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Title: Solar Motion


1
Solar Motion
2
Label front flap
  • MOTIONS OF THE EARTH
  • -DAY NIGHT

3
Solar Motion
  • Essential Question- Bell Ringer
  • Why does the earth have day night?

4
  • Do other planets have day night?

5
Solar Motion
  • The Earth is a sphere (ball shape). Because of
    this only half can be lit by the sun at any one
    time.

6
Solar Motion
  • The earth spins (rotates) on its axis.
  • The earth rotates in a counter-clockwise (west to
    east) direction
  • It takes 24 hours for the earth to make one
    complete spin

7
Solar Motion
  • The half that is facing the sun, has light (day)
  • The half that is facing AWAY from the sun has NO
    light (night)
  • Planets moons that rotate also have day and
    night

8
Solar Motion
  • Essential Question
  • Why does the earth have seasons? Do other
    planets have seasons?

9
Solar Motion
  • Space objects are held in orbit by a force called
    gravity (pull). Because of the pull of gravity
    between the sun and the planets, the planets
    follow a curved path (orbit) around the sun,
    instead of traveling in a straight line out into
    space.

10
Revolution
  • The earth revolves (follows a path) around the
    sun.
  • The path it follows is called an orbit.

11
Revolution
  • Distance from the sun ONLY affects
  • How long it takes for the planet to make one
    complete trip around the sun (year)
  • The farther away from the sun, the larger the
    orbit, the longer time it takes to make one
    complete trip around the sun
  • Distance from sun does NOT affect temperature as
    long as we are in orbit

12
Solar Motion
As the earth moves around the sun in its orbit,
the tilt of the axis stays the same.
13
Solar Motion
  • As the earth moves in its orbit around the sun,
    the position of Earth in its revolution causes
  • Sometimes the northern axis is leaning toward the
    sun, sometimes away, sometimes in between

14
Solar Motion
  • Sometimes the northern axis is leaning away from
    the sun
  • Sometimes the northern axis doesnt lean either
    away or toward the sun

15
Solar Motion
If there was no tilt, the suns rays would not
hit the earths surface so differently. Note the
differences in the places that have day.
23 degree tilt to axis
No tilt to axis
16
Solar Motion
  • Because the earth is a sphere and the earths
    axis is tilted at about a 23 degree angle,
  • the suns rays do not hit earths surface the
    same way if the northern axis is pointed toward
    the sun as it does when the northern axis is
    pointed away from the sun

Northern axis away from the sun
Northern axis toward the sun
17
Solar Motion
  • When the northern axis is leaning towards the
    sun, the northern hemisphere gets the most direct
    rays
  • Because of the position of earth in its
    revolution, days are longer so the earth has more
    time to absorb energy from the sun so the days
    are hotter.

18
Solar Motion
  • When the northern axis is leaning away from the
    sun, the northern hemisphere gets the least
    direct rays
  • Because of the position of earth in its
    revolution, days are shorter so the earth has
    less time to absorb energy from the sun so the
    days are cooler.

19
Solar Motion
  • The winter solstice is the shortest day longest
    night of the year. (December 21)
  • At the opposite side of the orbit, is the summer
    solstice (the longest day and the shortest night
    of the year. June 21)

20
Solar Motion
  • At the positions in earths orbit where the hours
    of day night are equal, the northern axis is
    not leaning toward or away from the sun.
  • These days are called equinoxes. The spring
    equinox is on March 21, the Fall equinox is on
    September 23

21
Solar Motion
  • The earth revolves in a counter-clockwise motion
    around the sun.
  • The days get longer between December and June.
  • The days get shorter between June and Dec.

22
Solar Motion
Planets that have a slight tilt to their axis
will also have seasons
23
Solar Motion
  • Essential Question
  • Why do the sun, moon, stars APPEAR to rise in
    the east and set in the west?

24
Solar Motion
  • The earth rotates around its action in a
    COUNTER-CLOCKWISE direction.
  • This causes the sun, moon, stars to APPEAR to
    rise in the East and set in the West.
  • The earth is actually the one moving

25
Solar Motion
  • In the summer, the sun makes a shorter shadow at
    noon than in winter.
  • This is because the sun is lower in the sky.

26
Solar Motion
  • The suns path across the sky is called the
    ecliptic.
  • The sun follows a different path in each season.

27
Solar Motion
  • In the Northern Hemisphere. the suns path is
    higher in the sky in the summer.
  • The sun follows a lower path (closer to the
    horizon) in the sky in the winter.

28
Solar Motion
  • In the Spring Fall, the sun follows a path that
    is higher than in winter, but lower than in
    summer.

29
Solar Motion
Winter
noon
  • sunset

sunrise
Summer
30
Solar Motion
  • Stars also seem to rise in the East and set in
    the West

31
Solar Motion
  • Stars that are above the North Pole appear to
    rotate around the North Star
  • This apparent motion is caused by the earths
    rotation

32
Solar Motion
  • An eclipse occurs when the sun, moon, earth
    line up.
  • A solar eclipse occurs when the moon is between
    the sun earth and the moon casts a shadow on
    the earth (blocks out the sun)

33
Solar Motion
  • Total Solar Eclipse

34
Solar Motion
  • A lunar eclipse occurs when the Earth comes
    between the sun moon. The shadow of the earth
    covers part or all of the moon.

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Solar Motion
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Solar Motion
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