Hi all,(adsbygoogle = window.adsbygoogle || []).push({});

hopefully someone can help me out here:

I'm looking at the Gibbs' method for orbit determination, and I'm losing the conceptual picture in the vector calculations.

I have no problems seeing howDandNpoint in theWdirection (PQWcoordinate system), but I'll be damned if I can get a grip outside of simply swimming through the math whyS: [(r2-r3)r1+ (r3-r1)r2+ (r1-r2)r3] points in theQdirection.

Anyone have any insights?

I'm reading ValladoFundamentals of Astrodynamics and Applicationssection 7.5.1 if it helps.

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# Conceptual Question in Gibbs Orbit Determination

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