In re-creating the opening crawl, I had a hillbilly way of trying to emulate the angle of the text from the camera: I screencapped the ROTS opening crawl, then had a dummy rectangle, and tilted that back until the vertical lines were parallel. It appears that 75 (or 15-degrees raised from the ground) is the proper angle of the text:
If anybody knows of a more precise way to measure this, I'd definitely be happy to hear them (just to refresh my geometry, which has clearly gone soft!)