From a metric maybe the Schwarzschild, you can find g in co and contra varient forms. From that you can calculate Affinity.(adsbygoogle = window.adsbygoogle || []).push({});

My question is from the Null Geodesic equation (ds=0) what do the three contravarient vectors represent? Do they represent the path of a planet around the sun or the path of a moon around a planet?

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# The three vectors in the Null Geodesic equation

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