NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: great circle distance
From: Frank Dinkelaar
Date: 2000 May 24, 01:35 EDT
From: Frank Dinkelaar
Date: 2000 May 24, 01:35 EDT
The explanation by Bill Trayfors is problably the same as was meant here. This is the original cos D = sin L1 (+ or abs. diff.) sin L2 (abs. diff) (cos L1 * cos L2 * cos DLo) The confusing part here is that a difference is stated and this was my interpretation cos D = abs(sinL1 - sinL2) - abs(cosL1 x cosL2 x cos Dlo) Bill change the sign of L2 when you cross the equator which in the end seems to be the same as changing the sign between the two parts of the formula Thank for all the comments I am now going to attempt to make a program (VB) that will show all the course changes at the press of a button (maybe!)