I assume this is rather elementary so I'll be brief.(adsbygoogle = window.adsbygoogle || []).push({});

I have a point in an xyz coordinate system, this point is assumed to lie on the surface of a sphere with radius R. Suppose I know the coordinates of this point, how would I go about solving for the unitvectors pointing "due north", "due west", "due south" and "due east" along the surface of the sphere at this point ?

Thanks.

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# Vectors along surface of a sphere

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