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    Re: Basics of computing sunrise/sunset
    From: Christian Scheele
    Date: 2009 Jun 17, 22:57 +0200

    ----- Original Message -----
    From: "Christian Scheele" 
    Sent: Wednesday, June 17, 2009 10:41 PM
    Subject: [NavList 8673] Basics of computing sunrise/sunset
    > I'm trying to solve the following sunrise/sunset astronomical triangle and
    > am encountering unexpected pitfalls.
    > cos(LHA) = [sin (a) - sin (lat) sin(dec)]/ cos(lat)cos(dec)
    > where I am assuming a = -0.83 degrees
    > It is of course something very basic and I'm almost embarassed to say that
    > although I keep rechecking what I'm doing, I remain with an error of about
    > 15 minutes by the time I get to the final result in mean zone time. Before
    > I
    > drag everybody into it, could somebody please tell me whether there are
    > any
    > snags that I should look out for?
    > >
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