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    Re: Quicker Ex-Meridian Formula for Slide Rule or Calculator
    From: Greg Rudzinski
    Date: 2016 Nov 30, 09:07 -0800

    Francis,

    With ex-meridian calculations only 3 place accuracy is needed for 0.1' accuracy by formula so a 10" slide rule is good enough. The limit to accuracy is meridian angle. The smaller the angle the smaller and more accurate the resulting ex-meridian correction. I like to keep the meridian angle below 7°.  Another factor to keep in mind is the altitude of the observation. The lower the better.

    Greg Rudzinski 

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