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## Main Question or Discussion Point

I am beginning to study the mathematics of curvilinear coordinates and all textbooks and web sites do not have realistic examples of non-othogonal systems.

What are some examples of non-orthoganal curvilinear coordinates so that I can practice on actual systems rather than generalized examples?

All the coordinate systems that I've examined, such as parabolic cylindrical, ellipsoidal, spherical, and polar cylindrical, are all orthogonal. There must be lots of non-othogonal examples.

What are some examples of non-orthoganal curvilinear coordinates so that I can practice on actual systems rather than generalized examples?

All the coordinate systems that I've examined, such as parabolic cylindrical, ellipsoidal, spherical, and polar cylindrical, are all orthogonal. There must be lots of non-othogonal examples.