There seems to be 2 different " Moon Guides " out there. The Hannon Moon Clock and The Deer Hunter's Moon Guide.
They do seem to work. I find the Hannon Guide the easiest to use. http://www.datasportinc.com/shop/intro.cfm
I've been running cameras on 3 baits for 24 hr. periods, and have found these guide to be fairly accurate. Just remember that they are talking IDEAL weather. Rain, high winds, Hot weather,and the rut can affect movement.
If nothing else you can look at your Moon Guide and roll over in bed thinking that nothing will cross your stand.