NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Location Center of Responses thus Far
From: John Germain
Date: 2001 Jul 23, 9:15 PM
From: John Germain
Date: 2001 Jul 23, 9:15 PM
Standing off beyond the expected launch paths might be advantageous! John Germain > ** Original Subject: Re: Location Center of Responses thus Far > ** Original Sender: WSMurdoch@AOL.COM > ** Original Date: Tue, 24 Jul 2001 02:43:06 +0100 > ** Original Message follows... > > In a message dated 7/23/01 9:05:58 PM Eastern Daylight Time, > glendonJLM@BIGPOND.COM writes: > > > > Its an optimisation problem isn't it? > > > > Let x be the unknown location centre > > Let D(i) be the great circle distance between the i th member and x > > Then we want to choose x such as to: > > minimise{sum of [ D(i); i=1-n]} > > > > or, minimise{sumof[ square of D(i): i=1-n]} > > subject to x lying between lat and lon of 0-360 > > > > hmmm, shipping or airline companies must have tackled this one?? > > > > Sounds military to me. Where should I park my guided missile submarine so > that the average time of flight to my targets is a minimum ? > > Bill Murdoch >** --------- End Original Message ----------- ** > Jersey British Channel Islands