NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Sight Reduction Formula Question
From: FS
Date: 2005 Jan 7, 08:19 -0800
From: FS
Date: 2005 Jan 7, 08:19 -0800
Thanks Fred, you are absolutely correct, Turner does indeed explain that the short one can yield 180 deg ambiguity. I should have kept reading. --- Fred Hebardwrote: > I believe Turner gives the reason for the longer > formula and also shows > the shorter one, saying the shorter one can be > inaccurate in some cases. > Fred > > On Jan 7, 2005, at 10:24 AM, Fried Squash wrote: > > In _Celestial for the Cruising Navigator_ by Merle > > Turner, the navigational triangle azimuth formula > is > > given as: > > > > cos Z = (sin d - (sin L * sin H ))/(cos L * cos H) > > > > but Dutton's Navigation and Piloting gives the > much > > simpler: > > > > sin Z = ( cos d * sin t ) / cos H > > > > They both seem to work. But there must be some > reason > > that the longer one is better, right? Works in > more __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. http://promotions.yahoo.com/new_mail