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Rotation of Earth

  1. Nov 18, 2009 #1


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    i have a little telescope of 70mm in diameter and 600mm focal length, its just good too see ...birds, but when i use the 9mm eyepiece and zoom to a star , the star's image will quickly pass to the vision field because of the rotation of the Earth. What i observed could be just an, optical illusion but it seems that the movement of the star in the image its not constant but its jerking, its like a non uniform motion , ...have any idea?
  2. jcsd
  3. Nov 18, 2009 #2


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    It's pretty uniform!
    The jerky motion is either due to movement of the telescope shaking in the wind, or at high magnification the atmospheric turbulence or 'seeing'
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