I've seen some very respectable hunters use the moon guide with pretty good results. Murray Moon guide seems to be one of the more popular. It's not something to swear by but it gives the the better than average mornings to hunt and the better than average evenings. Weather and such also play a major factor but if I had a couple days out a a two week period in the non rut I'd use the moon guide to give myself an advantage. Even if its just a small advantage, its still an advantge.