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Something must hide the asymmetric part.","posed_since":"","precise":"Cassini Grand Finale data bound Saturn's dipole tilt below about 0.01 degree, while Cowling's theorem forbids a dynamo-maintained axisymmetric field. Test whether a stably stratified, electrically conducting layer (for example from helium rain) with differential rotation filters non-axisymmetric harmonics strongly enough, consistently with gravity and ring-seismology constraints on interior structure. An answer is a self-consistent dynamo with such a layer reproducing the observed Gauss coefficients.","problem_ref":null,"references":"","settled_by":"Dynamo simulations with interior structure from gravity and ring seismology reproducing Saturn's measured field spectrum.","status_note":"","title":"Why is Saturn's magnetic field almost perfectly symmetric about its spin 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