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    Re: Smart and Shearme Position Line Tables
    From: Lars Bergman
    Date: 2020 May 4, 13:50 -0700

    Now a new try on the formula that David C asked about. How to find azimuth when knowing latitude, altitude and hour angle?

    cos(azimuth - x) = cot(latitude)·tan(altitude)·cos(x),  where tan(x) = csc(latitude)·cot(hour angle)

    or, using the more common trig functions

    cos(azimuth - x) = tan(altitude)·cos(x) / tan(latitude),  where tan(x) = 1 / [sin(latitude)·tan(hour angle)]

    That spherical triangle is uniquely defined.

    Lars

       
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