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    Re: Lunar longitudes, not by lunar distance.
    From: Geoffrey Kolbe
    Date: 2009 Aug 09, 16:46 +0100

    George [NavList 9432] wrote
    
    
    >Indeed, that would be the case, if we were measuring azimuths, but we're
    >simply timing the Moon as it passes a vertical line, so the correction is
    >constant in time, independent of altitude.
    
    Sorry George, am I missing something here? The point I was alluding
    to is that when you time the edge of the moon as it touches the
    vertical hairline, the centre of the moon is then not just a
    'semi-diameter' away, but a 'semi-diameter divided by the cosine of
    the altitude' away in azimuth. Since the tables for the moon's
    position are for the centre of the moon, that is the correction you
    must make to determine the LHA between the moon and the star at that
    moment in time. Is that not so?
    
    Geoffrey
    
    
    
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