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    Re: Ex-meridian sun sights
    From: Greg Rudzinski
    Date: 2014 Oct 5, 14:17 -0700

    Excellent post Frank.

     

    Randy,

    Attached are a few ex-meridian examples by formula vs. standard LOP and then a LAN. Since I know my position exactly by GPS there is good correlation between the ex-meridian and standard LOP reductions. If longitude becomes uncertain then differences will be greater. This can be seen if the formula LHA value is shifted by a few tenths of a degree.

    To test the limits of the formula an ex-meridian was done 35 minutes after LAN and has a difference of 1.2' when compared to the standard LOP reduction. So it is best to stay within the limits of Bowditch table 25.  

    Greg Rudzinski



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