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Motions of the Solar System.ppt

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									Motions of the Solar
      System
          Earth’s Motions
Earth has Three Motions
1. Daily
2. Yearly
3. Cyclic
                   Earth’s Motions
Rotation
 Causes Day and Night
 Two types of Day
       Sidereal
         • Time it takes for the Earth to make one Complete
           rotation
         • 23 hrs and 56 minutes
       Solar
         • Time it takes to go from one Noon to the Next
         • 24 hours
   Earth has a tilt of 23.5 Degrees
       One cause of the seasons
How Fast are We Moving?
                 Earth’s Motions
Revolution
 Earth’s Yearly Journey around the Sun
 365 days
 One Cause of the Seasons
       Changes the Amount of solar radiation reaching
        the earth
   Aphelion
       Furthest point away from the sun
   Perihelion
       Closest point to the sun
      Annual Motion of the Earth
 Earth’s Annual Motion around the Sun is
  an ellipse
 Ellipse
     An Elongated Closed Circle
     Sun is not at Center
Earth’s Motions
Precession
The Cause of the Seasons
     Sun Position Relative to Earth
                   Degrees in
    Event                                 Date         Season
                    Latitude
Vernal Equinox      0 or Equator        March 21st     Spring

                   23.50 N or
Summer Solstice                         June 21st      Summer
                Tropic of Cancer

   Autumnal
                    0 or Equator      September 21st    Fall
   Equinox

                  23.50 S or Tropic
Winter Solstice                       December 21st    Winter
                    of Capricorn
No Tilt, No Seasons
Height of Sun in Sky
Angle of Insolation
Angle of Insolation
Length of Day and Latitude
Latitude and Amt. of Solar
        Radiation

								
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