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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg B
Date: 2014 Nov 24, 18:04 -0500
I have been following the haversine discussion with great interest.
One post said that everything (formulas I guess) fit on a 3X5 card (?)
What about the haversign table?
I am thinking of making my own tables; I wonder to what resolution
would you expect to go down to?
Thanks,
~Greg
On 11/23/2014 04:06 PM, Greg Rudzinski wrote:
Hanno,
The formula varient that you show is actually what I used to format the index card reduction. It works well to save space. For same name N=hav(L-D), P=hav(L+D). For contrary name N=hav (L+D), P=hav (L-D). For calculator reductions Hc= Arc Sin [1-2(x), x=N+(1-Q)*havLHA.
I prefer to us different letters where n=(L+/-d),m=(L+/-d), P=(1- (n+m))*havLHA, ZD=Arc hav(n+P). This way when Bowditch is consulted there is better agreement.
Greg Rudzinski
From: Hanno Ix
Date: 2014 Nov 23, 10:10 -0800Greg,there is a form of the hav-Doniol some people might prefer.Mathematically, there is no difference to the original formulation.Here it is:
define: N = hav( L - D );
define: P = hav( L +D );
define: Q = N + P;
hav(s2s) = N + ( 1 - Q )* hav(LHA);
