A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Samuel L
Date: 2015 May 18, 17:36 -0700
I tried a reduction using the Haversine method Greg lists (for Deneb) on his s/v Nightcap site (http://gregrudzinski.blogspot.com/)
I deteremined Hc with not too much trouble but can't figure out how to calculate Zn. He shows 360d - 16d= 344
Would you, or Greg, please explain how to determine Zn....in very simple terms?
very easy calculation of Hc. Only one table, 2 pages, is used and only one
multiplication is needed. There are no complicated sign rules
and special cases - it will work for all permutations of L, d and LHA.
Given: L, d, LHA, find Hc. Execute these 6 elementary steps:
4. calculate n + ( 1 - q ) * hav ( LHA ); this yields hav ( ZD )