NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2014 May 30, 12:26 -0700
Attached is a further refined index card sight reduction using the Ix cosine sum method. Notice for this reduction that the S value is larger than 90 degrees which requires using the cosine complement as a negative value for summing. Calculators automatical show the correct value. For natural trig tables there will be a little extra work.
The third column is the double cosine sum = sine product of standard formula
The fourth column is the quad cosine sum = cosine product of standard formula
Same rules apply for final summing of values.
Add if same name, subtract if contrary for LHA 270 to 360;000 to 090
Subtract if same name, add if contrary for LHA 090 to 270
Greg Rudzinski
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