请教翻译：projected slant

aaronfangUID：110875

请教翻译：

Azimuth angle is defined as:
At the tangential plane at the receiver, there are two lines. One is the projected
slant into this tangential plane and the other is the line pointing to the north pole
from the receiver (so far, you can consider receivers at the North Hemisphere only).
The azimuth angle is the angle of the projected slant away from the line pointing
to the pole in counterclock direction.


这里的projected slant啥意思啊？