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I have 35 x, y, z co-ordinates on a sphere surface and I need to calculate the sphere centre point. I am currently using sets of 4 points and determinant equations as shown at http://local.wasp.uwa.edu.au/pbourke~/geometry/spherefrom4/

This method works fine but I want to know the theory behind how the calculation works and also if this is the best method to use. Any help/recommended textbooks/websites would be much appreciated.

This method works fine but I want to know the theory behind how the calculation works and also if this is the best method to use. Any help/recommended textbooks/websites would be much appreciated.

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