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Aug 20, 2013 at 18:10 vote accept Ruslan
Aug 20, 2013 at 17:53 answer added Ted Shifrin timeline score: 9
Aug 20, 2013 at 17:38 comment added BaronVT I would think you could first transform coordinates through a non-rotation conformal map, and then define spherical coordinates in terms of the new variables to get a new, non-trivial set of orthogonal coordinates.
Aug 20, 2013 at 17:27 history asked Ruslan CC BY-SA 3.0