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    Re: Sun sights at the Gulf of Mexico
    From: Fred Hebard
    Date: 2016 Feb 24, 09:45 -0500
    Bill,

    If you are using pyphem to compute altitude from your position, I believe the way you are using it is that it is correcting for refraction, etc, in its computed altitude.  Make sure you are comparing the same values.

    Fred

    Fred Hebard

    On Feb 24, 2016, at 8:08 AM, Bill Lionheart wrote:

    My sun sights using a tray of water for an artificial horizon in my garden seem to be too low by about 3 minutes. I have corrected my sextant for index error. I's there anything else I should look out for? Could it just be poor technique? Could I have errors of this size in my arc? If I can't do it in ideal conditions in my garden I will be worse at sea!


       
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