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    Re: Plotting vs calculating Position
    From: Bob Goethe
    Date: 2015 Jul 30, 12:55 -0700

    I am intrigued by the equation to correct for motion-of-observer:

    ΔHo = (SΔt/60)*cos(Zn-C)

    Is it feasible to calculate this using a slide rule where (Zn-C) is greater than 90°?  I have never done sines/consines on a slide rule where any of the angles were larger than 90°.

    Bob

     

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