3D coordinates on a sphere to Latitude and Longitude

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I guess it should not be difficult to find the spherical polar coordinates from x,y,z (3d-coordinate system).

  1. r is always constant if it’s on surface.

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  2. (90 – θ) your latitude (negative means it’s on the bottom) as it’s measured from top.

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  3. φ is your longitude. (but not quite sure about longitude system)

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Also check this diagram from wikipedia.

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