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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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