NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: AP terminology
From: Geoffrey Kolbe
Date: 2009 Nov 14, 08:33 +0000
From: Geoffrey Kolbe
Date: 2009 Nov 14, 08:33 +0000
Peter Hakel wrote [NavList 10645]: >Since LOPs are one-dimensional objects, you need precisely one >parameter to characterize them. It is this parametrization that >amounts to "calculating the LOP directly" (answer to Geoffrey >Kolbe's question). Sumner used longitude as the parameter. The >parameter doesn't have to be longitude and in the case of >LOP=meridian, it is in fact unsuitable. Sorry Peter, this does not answer my question - how do you calculate the LOP "directly"? And I don't think I agree with you anyway about just needing one parameter to characterise an LOP. LOPs are two dimensional objects (they are lines) and - at least within the reference frame of standard spherical trig where the origin is the centre of the earth - need two parameters to characterise them. In standard St. Hilaire terminology, the two parameters are a bearing and an intercept distance from the estimated (assumed, dead reckoning) position. Echoing Frank in posting 10667, I would appreciate it if Karl came back and explained what he means by calculating the LOP "directly". Geoffrey Kolbe --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com -~----------~----~----~----~------~----~------~--~---
