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Far easier for Poser is to calculate the cosine of the angle. I don't know if you are familiar with vector math, but it turns out that given two vectors, P and Q, the cosine of the angle between them is trivially given by computing the dot product of P and Q, as long as the vectors are unit length. In math notation, you actually write a dot between them, but I don't know how to type such a thing, so I'll just say P dot Q.

Just a quick remark: another common notation for the dot product (a.k.a. scalar product) is <P,Q>.

-- I'm not mad at you, just Westphalian.