A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Doniol for time sight reduction?
From: Greg Rudzinski
Date: 2015 May 16, 21:56 -0700
The attached example may be what you were originally looking for (Doniol haversine time sight method). The long division requires care. Should work good with the Ottis King. See Lars post which shows a very concise arrangement of the formula.
From: Francis Upchurch
Date: 2015 May 15, 23:09 -0700
Thanks Greg and Dave.
I did not know about Rust, but had the old 19th century Bowditch.(just found a copy of Rust for £12. ) I'll try the Rust + Otis King idea. (works well for Doniol Hc calculation). the Fuller does the Cosine formula fine. Dave, good idea re yet another slide rule! Maybe one day!
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