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Homework Help: Angular Separation Between Two Stars

  1. Sep 23, 2005 #1
    :confused: I aim trying to do a problem where I have 2 Equatorial Coordinates, and I need to find the angular distance in between this two points. Thanks in advance. :confused:
  2. jcsd
  3. Sep 23, 2005 #2


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    Homework Helper

    Do you mean RA and dec?

    If the stars are close to one another you can use Pythagoras.
    declination is already in actual degrees;
    Right Ascension must be converted from hours to degrees,
    (15 deg/hr) cos(dec) , to compensate for meeting at the pole.

    If the stars are far apart, you'll have to make a great circle
    that passes through them both.
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