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    Re: Compass correction using sunrise
    From: Andrés Ruiz
    Date: 2022 Jun 30, 15:50 +0200
    It is interesting to remark that in 5s of time the azimuth of the rising sun increases in nearly 1º.

    16/06/2022
    08:14:43 UT1
    48º 17.0' N
    062º 28.0' W

    Sun derivatives
    dH/dt = 8.018169 º/h = 481.1 '/h = 0.13 '/s
    dZ/dt = 11.193951 º/h = 671.6 '/h = 0.19 '/s
    dDec/dt = 0.001445 º/h = 0.1 '/h = 0.00 '/s
    dGHA/dt = 14.997691 º/h = 899.9 '/h = 0.25 '/s

    As is shown in the document: dHdt dZdt.Sun.pdf, (other date/time and location), the change in azimuth dZ/dt is minimum during the rise and set, but of considerable value.  

    For magnetic compass total correction, (deviation + variation), I prefer to use the azimuth Zn formula rather than the Amplitude (H=0) one because I do not care about the little height above the horizon.

    Fair winds.
    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

    File: 152863.dhdt-dzdt.sun.pdf
       
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