Artificial intelligent assistant

Good book on Spherical Trigonometry Possible approach/content: * Modern * Practical (Navigation/Geodesy) * unifies with Euclidean/Hyperbolic Trigonometry

I don't know exactly if this is what you are looking for or if it's at the right level, but you might want to have a look at the first three chapters of John Ratcliffe's _Foundations of Hyperbolic Manifolds_. They concern Euclidean, spherical and hyperbolic geometry (with sections about trigonometry), and the book is modern and (in my opinion) well-writen.

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