If you are talking about the orientations of your measurement surface elements, these are contained in your provided “points.txt” file, where each position and orientation (6 values) will correspond to a row in the generated matrix.
It sounds like you want to know the direction of the rays that reach the sky, which are binned according to the “skyglow_r6.rad” options. I would have to see that file to know what you specified in there, but the output matrix columns will correspond to the directions in the sky subdivision. If you included a ground plane as normally recommended, then the first matrix column will be the average of all downward-directed rays. However, since everything gets averaged together, you cannot know how much each actual sample ray contributed. To get that level of granularity, you would probably need to use rtrace.