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    Re: True Distance vs. Observed Distance
    From: Greg Rudzinski
    Date: 2012 Sep 18, 14:39 -0700

    Frank,

    The 0.1' per 5* refraction approximation for refraction between star distances above 45* elevation is accurate enough I think for determining index error. I will be using it from now on.

    Can you expand on how star to star distances shift 0.3' each year? I take it that stars opposite the Sun will always be at the mean of this 0.3' cycle.

    Greg Rudzinski
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