I believe it a compromise between getting in the way of one¡¯s head and having to reach the altitude adjustment knob which having the scope at 90 degrees would be frustrating.
Any offset angle moves the scope out of the way...that does save ones noggin.?
But but but...
That's why the polar scope hole should be at 90 degrees.? Why would you want to put it at 60 degrees CW? ... Which is 120 degrees in the CCW direction. ?
Just makes another IQ test in the dark.? You wouldn't want to stick you finger in there or lop it off in the dark.? I will mark the angle with a sticky label ...?