A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robert VanderPol II
Date: 2016 Jul 16, 09:30 -0700
It just occured to me why the Ageton tables include the first decimal for some values of A & B. It is to make interpolating easier if the user decides to do so. When the values are the same for 2, 3 or more angles in a row it is harder to interpolate, by adding the decimal you only need to work with 2 numbers rather than 3 or more for the interpolation to be accurate. For the rest of the range where values are reported with no decimal, when you start interpolating, you are dealing with only the values to either side of the intermediate angle you want so the interpolation only involves 2 values.
In normal use round the decimals to the nearest whole number.
When you start interpolating the angles decimals become significant for some of the value so having decimals for some of the table values eases the interpolation process.