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!)
