NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Z tangent formula
From: Peter Fogg
Date: 2005 Jul 14, 19:01 +1000
From: Peter Fogg
Date: 2005 Jul 14, 19:01 +1000
> From: Peter Fogg > Sent: Monday, 11 July 2005 10:31 AM > To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM > Subject: Re: Z tangent formula > > ... am interested in finding other formulas for the calculation > of azimuth for comparison. Have found this one: Chuck Pettis' Azimuth equation: AZ = acos ((sin D - (sin L * sin H) / (COs L * COs H)) where H = horizon height (degrees) (The H has me puzzled. Perhaps it refers to Dip, or could it refer to altitude?) Here's another: Z = cos^-1 * [sin Dec - sin Lat * sin h / cos Lat * cos h] where h = vertical angle to the sun corrected for parallax and refraction (h = altitude?)
