NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Great circle distance
From: Zorbec Legras
Date: 2000 May 23, 09:40 EDT
From: Zorbec Legras
Date: 2000 May 23, 09:40 EDT
Van: Frank Dinkelaar <frank.dinkelaar@XXX.XXX> Aan: NAVIGATION-L@XXX.XXX Onderwerp: Re: short horizon Hs correction Datum: din, 23 mei 2000 13:28 cos D = abs(sinL1 - sinL2) - abs(cosL1 x cosL2 x cos Dlo) why abs? look at this it comes from a time there was no Electonic calculators a= (sin l1 X sin l2) ==> sign of a is + l1 l2 same name / - diff name b= (cos l1 X cos l2 X cos Dlo) ==> sign of b is + if Dlo < 90?/ - if DLO > 90? cos D = a-b D in minutes of angle is the distance in Nm Pm if Dlo > 180? turn the ship! Cpt. Zorbec . ______________________________________________ FREE Personalized Email at Mail.com Sign up at http://www.mail.com/?sr=signup
