Re: Dozier Formula
Subject: Re: Dozier Formula
From: Aubrey O'Callaghan (ocallaghan@XXX.XXX)
Date: Tue Nov 20 2001 - 08:01:20 EST
Dan,
The reason for going rectangular to polar is so that the solution comes out
in the correct quadrant.
You can appreciate that arctan (A/B) = arctan(-A/-B). One solution is in
the NE quadrant the other in the SW quadrant.
Some programming languages have a function atan2 which takes 2 arguments
and ensures that the computed angle is correct. (m.soft excel has this).
The R->P is a workaround for calculators.
Aubrey.
At 14:36 19/11/01, you wrote:
>Rewritten as because of the result coming out 180 degrees off and of using
>the Polar-to-rectangular function:
> tan(Zn - 180) = sin LHA / cos LHA * sin L - cos L * tan d
>
>Then *using invented notation* rewritten again as:
> Zn = 180 + R->P (sin LHA * cos d, cos LHA * cos d * sin L - cos L
> * tan d
>
>Now can someone explain what the COMMA after the first cos d stands for?
>
>
>Dan Hogan WA6PBY
>C27 "Gacha"
>dhhogan@XXX.XXX
>Nav-L Page: http://www.wa6pby.com
