NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Marq St. Hilaire - Altitude intercept method
From: Andrés Ruiz
Date: 2007 Oct 26, 08:52 +0200
From: Andrés Ruiz
Date: 2007 Oct 26, 08:52 +0200
In messages: [NavList 3572], [NavList 3588], [NavList 3596] There is an error of concept. Gary is not absolutely correct. > St. Hilaire's method created the exact same LOP as Sumner's method but > only required doing the computation one time, saving work and reducing > the chance for an error. The Sumner and the St-Hilaire LoPs are not the same. One is secant to the circle of equal altitude and other is tangent. This means that the points in common between the CoP and the each LoP are different. If You get the analytic equation of each LoP on a Mercator chart You can see that the two lines are not the same. For more details see the attached PDF. Please, I want to hear more opinions. Andrés Ruiz Navigational Algorithms http://www.geocities.com/andresruizgonzalez --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
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