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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: POL and arctan2
From: Bill B
Date: 2005 Nov 10, 20:15 -0500
From: Bill B
Date: 2005 Nov 10, 20:15 -0500
>> In the polar-rectangular conversion formula, we know that, by definition, R >> squared = x squared + y squared.and that... George: Put simply. All R-P knows how to do (when properly signed) is connect the dots. Give it an x and y value relative to 0,0, and it reports a distance and angle from 0,0. It does not know you messed with it's little routine when you determined the values for x and y. Let GCD = Great circle distance Instead of the first value being the distance it is the sine of an angle determined by: Chord of GCD x 360) / 21600 which nominally equals Chord GCD/60 in our case What we would minimally hope for is the sine of GCD/60. Yes? Bill