I used to get worked up about the fact that they wouldn't just say 1/2 hour before and after sun rise/set. Then I started thinking, you know maybe it's best it's left the way it is, and it's left vague for a reason. What if you field is sloped such that it's oriented south, and atmospheric conditions allow light such that you can shoot at 35 minutes after sunset and at 33 minutes the buck of a lifetime walks out and you get a ticket? Sounds like the current state of affairs allows for sensible behavior without getting a ticket.

Of course if dumbazzes start shooting people, theyll be forced to lock er down and enforce accordingly.