A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Arthur Pearson
Date: 2002 Oct 22, 22:29 -0400
I am a user of the S Tables, a very compact set of tables (about 10 pages) that allow reduction of an altitude of any body directly from the DR position (available at Celestaire.com). The tables include a very good set of instructions with a clear explanation how the navigational triangle is solved by way of the work forms (also included). The work forms also serve as a guide to using a scientific calculator to reduce the sight.
The S Tables include an “S value” and “C value” for every angle to a precision of 0.’1. By following the forms, it is clear that the “S Value” allow one to multiply or divide sines and cosines of angles by adding or subtracting the S or C value in the table. It would seem that these S Table values should be the log of the sines and cosines, but when I try to replicate them with a calculator I can’t do it.
My question is: What are S Table values?