# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

**Dozier Formula**

**From:**Dan Hogan

**Date:**2001 Nov 19, 11:37 AM

First I am not a trained mathematician, I need a calculator to work higher math ;^) For years I have used the dozier formula from The Calculator Afloat, by Schufeldt & Newcomer for sight reduction with a calculator. The normal Dozier formula is: tan Zn = sin LHA / cos LHA * sin L - cos L * sin d 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@verimail.com Nav-L Page: http://www.wa6pby.com