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    Re: Accuracy of sextant observations at sea
    From: Greg Rudzinski
    Date: 2010 Nov 29, 10:01 -0800

    Andres,

    I stand corrected and have confused Ho with Hs in Alan's original post. My Jupiter Dec. and GHA was a bit off as well. Your graph shows the plot nicely and if Formalhaut is omitted as Jeremy has suggested because of a late twilight horizon then we are left with two LOP's that are toward the body at 1.6' and 1.7' . This suggests a possible systematic error with the leading culprits being index error and or dip correction. Setting a star/planet on the horizon rather than splitting the star/planet with the horizon may also be adding a few tenths to the observed altitude.

    Greg Rudzinski
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