A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Mike Freeman
Date: 2017 Mar 28, 00:19 -0700
In my earlier post I indicated I only had 1 page of AP3270 Vol 3 in my book (Mary Blewitt) for reference. I thought the tiny - signs against the d values were intended to be minus signs. Additional evidence by inspection of the data revealed as the declination increases from 15 to 29 degrees the Hc reduces.
I have downloaded AP3270 Vol 2 & 3 and note that when Hc increases in line with an increase in declination no sign is given against d values (no + sign). Assume to be additive unless otherwise indicated.
Is this a reasonable observation.