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Euler rotations in galactic plane to change to equatorial

  1. Jul 16, 2010 #1
    HI there,

    I am having problems understanding something.
    If I have an axis pointing towards the galactic north pole, and I rotate it using an Euler rotations how can I can I establish the rotation angles needed so that it will be pointing to the equatorial North pole.
    I am looking for values alpha and beta where alpha can run from -pi-->pi and beta can run from -pi/2-->pi/2.

    Many thanks
     
  2. jcsd
  3. Jul 16, 2010 #2

    phyzguy

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  4. Jul 16, 2010 #3
    Thank you for your reply. I am getting confused still. Would the galactic north pole just have l=0 b=90 in galactic coordinates? I am imagining the surface of a sphere, if b=90 is the top point of the sphere, then there can be no l value as the horizontal plane through the sphere would just be a point.
     
  5. Jul 16, 2010 #4

    phyzguy

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    These types of coordinates systems have a singularity at the poles, so the north galactic pole has coordinates (L=anything, B=90). The same is true on the Earth. If the latitude is 90 degrees, it doesn't matter what the longitude is, you are at the pole.
     
  6. Jul 16, 2010 #5
    OK , of course, thanks !
     
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