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    Re: Angular Distance Between Stars By Camera and Sextant
    From: Marcel Tschudin
    Date: 2012 Sep 18, 23:04 +0300
    Greg, regarding

    On Tue, Sep 18, 2012 at 10:43 PM, Greg Rudzinski <gregrudzinski@yahoo.com> wrote:

    If you look at my original results:


    Alioth Alkaid Hc 31*37*
    10* 27.1' observed distance by sextant
    +0.3' refraction correction by table
    10* 27.4' true distance

    10* 27.6' true calculated distance by William's on-line calculator
    Low 0.2'

    Your nomenclature may be misleading. "True" is in this context generally used for the positions without atmosphere. If I understand you correct, then your refraction correction relates to a correction for difference in refraction, because your sextant observations from each star already contain refraction. Your "true distance" corresponds then actually to observed distance because they include refraction.  But, yes, indeed, the various results finally "converge" and we can now better evaluate them.

    Marcel
       
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