A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2017 Sep 1, 01:20 -0700
Thank you everybody for the clarification of the LL vs UL "quick and dirty" correction values - got it.
Now a question about the terminology used for the formula 7.5e: whether the "LHA" name is really appropriate for the angle returned by the cos-1 function. My take is - the name should be different if the angle is to undergo further modifications according to some rules. It must be - I think so - either the "LonD" (the term already used in the book, the "longitude difference"), or the "t" - the meridian angle. We get the LHA proper only after we apply the required rules to its value (and/or its sign).
As a nit-picking: the formula 7.5d would look better with the "±" in the cos(A - B) term.
The book is really great and I hope Mr Karl will have a chance to make it even better.
Thank you all again!
The "Position without St. Hilaire" article really made me thinking, I'll search in the NavList archive for the relevant discussion - and ask a question in a separate post.