NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John Karl
Date: 2010 Jun 3, 13:58 -0700
Hewitt, George, et al.,
We can see Hewitt is right by looking at Cos A = sin d/cos L when Hc = 0. (A is the calculator azimuth angle, not the table angle Z, or Zn.) When L is changed to minus L, we get the same A. The same is true if we switched d.
But with the refraction correction I used of -36.6' the azimuth equation is no longer symmetric in L and d. This difference in A can be up to 5 degrees.
Perhaps I should have included both pages of my table, as attached. It's really the same info that's in H.O. 249.
JK
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