I have a direction defined by azimuth and evation (e.g. Azi, Elev).
I would like to calculate values of these Azi i Elev after coordinate system
rotation: first around Z axis (angle e.g.: Zrot) and then around rotated (in first rotation
around Z axis) Y axis (angle e.g.: Yrot).
So: I rotate coordinate system around Z axis, then around "rotated" Y axis and I would like to
calculate Azi and Elev in rotated coordinate system.
How can be it done?