An diofar eadar na mùthaidhean a rinneadh air "Cruinne"

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Loidhne 13:
 
:''x'' = ''r'' cos(φ) sin(θ)
:''y'' = ''r'' sin(&phi;) sin(&theta;) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (0 &le; &theta; < &pi; andagus -&pi; < &phi; &le; &pi;)
:''z'' = ''r'' cos(&theta;)
(seall [[foincseanan triantanach]] agus [[co-òrdanaich cruinn]]).