Angle between Vector and plane xy

Dear Dynamo users,

I have a bunch of vectors (in a list) and I would like to find the angle the form with the horizontal plane xy. It should be easy, but I cannot find a node that can help me out.

Haven’t tested, but I think I have a solution for you. If you copy the vectors and set the copy Z to 0.0 then the angle between the new flat vector and the original vector will be the angle to plane you’re looking for

Although I would expect from dynamo something more straightforward this seems to be working fine.