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    Re: Basics of computing sunrise/sunset
    From: Christian Scheele
    Date: 2009 Jun 17, 23:07 +0200
    Right, and 34 minutes is refraction. Makes + 50 minutes in total to give 50/60 = ca. 0.83 degrees. If I don't hear from you I'll assume you agree and I'll begin to dissect my equation.
    Christian Scheele
    ----- Original Message -----
    Sent: Wednesday, June 17, 2009 10:51 PM
    Subject: [NavList 8674] Re: Basics of computing sunrise/sunset

    16 minutes is the half diameter of the sun?

    On Wed, Jun 17, 2009 at 4:41 PM, Christian Scheele <scheele{at}telkomsa.net> wrote:

    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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