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    Nautical Almanac Concise Method
    From: Dave Walden
    Date: 2009 Jul 9, 06:22 -0700

    Nautical Almanac Concise Method
    
    Attached is an excel spreadsheet (also opens under gnunumeric with linux) that 
    reproduces the two tables in the Nautical Almanac and can carry out and plot 
    an LOP calculation, rounding to tabular accuracy.  An interesting aside (and 
    only that!) is a demonstration of how a double interpolation at the first 
    table entry can give an assumed position that makes the H and Z from the 
    second table entry exact; requiring no corrections.  The plotting was helpful 
    in de-bugging and understanding what was happening.  As usual no guarantees.  
    Seems to be working.  Be careful at high altitudes and latitudes.  May be a 
    few other pathological cases where various parameters approach multiples of 
    90 degrees.
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    File: 109042.nautalmmod4.xls
       
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