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    Meridonial Part
    From: Dan Hogan
    Date: 1997 Jul 09, 2:29 AM

    Welcome to the Navigation List. Here is a meridonial parts formula. It
    should be calculated to at least 4 decimal places, otherwise if it lies
    close to 90d or 270d a large error may be introduced in calculating the
    distance.
    
    M = 7915.7045 x log tan (45d+ L/2) - 23.2689 sin L
    
    M = meridonial part
    L = latitude
    
    I have a Mercator Sailing program for an HP32SII that I use as my primary
    DR. Before calculators I used Mid-Latitude Sailing restricted to 600 mi
    intervals.
    
    At 17:07 7/9/97 +0300, Russell Sher wrote:
    >Hi - I've just subscribed. Does anyone know the formula for calculating
    >meridional parts if given the Latitude ?
    
    
    
    Dan Hogan WA6PBY		Yacht GACHA
        West Covina, CA		Catalina 27
        dhhogan{at}lightside.com	San Pedro, CA
    
    
    
    
    
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