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    Re: Latitude from duration of day
    From: Tony Oz
    Date: 2018 Dec 18, 13:09 -0800

    Dear Lars,

    Thank you very much again! Your formula works.

    I checked the formula with those values of t and DecSun I used previously - nice correspondence. Casio fx-85ESPlus lets me to enter the whole formula - even as complicated as this one.

    Now for the formula itself - the most misterious part is the introduction of cos(t)/tan(Dec) as tan(θ). The rest was easy. I'd like to have an insight on why it is particularly tan() but not, say, cotan() of sin()?

    Warm regards,

    Tony

    60°N 30°E

       
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