NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Navigation exercise
From: Peter Fogg
Date: 2008 May 19, 12:23 +1000
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From: Peter Fogg
Date: 2008 May 19, 12:23 +1000
Anabasis wrote:
Peter is correct in saying that you can shoot a number of sights over
say 15-20 minutes and smooth a curve to determine not only latitude,
but also longitude by LAN.
Peter is correct in saying that you can shoot a number of sights over
say 15-20 minutes and smooth a curve to determine not only latitude,
but also longitude by LAN.
Just to be clear about this, my understanding is that observations over some hours, not minutes, both before and after LAN, are required to establish the parabolic curve that Jeremy describes. What I was proposing was sights over a few minutes, when for practical purposes this curve ressembles a horizontal line.
And yes, an error of slightly over 1 mile or minute of arc is a very good result.
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