Not sure what we disagreed about. My argument was that, as far as light conditions, 30 min. before sunrise is the same as 30 min. after sunset, so why not allow it. Right?
Kellory, actually, the difference between 30 min. before sunrise and 30 min. after sunset is variable, today being 14 hours & 37 min. I believe it is based on the positioning of your location on earth in relationship to the sun.
Keep life simple...if you hear hoofbeats, think horses, not zebras.