There are only a select few of those "Magical" days in a hunting season when the Moon is both directly overhead and directly underfoot with a couple hours of sunrise and then again sunset. Moon overhead seems to have more of an impact then moon underfoot, but they both influence activity. The forces of nature that move the oceans tides in and back out are the same forces that cause ungulates to get on their feet and feed. It's not that hard to believe if you think about it that way. There has also been research that shows that the gravitational pull of the moon has an impact on us humans as well. Any buddy work in a prison or emergency room? If so start paying attention to the moon.
Just as with anything, there is no guarantee you see a lot of deer when hunting by the moons location. If there are no deer in your area, you probably wont see deer. If it is 100 degrees, you probably wont see deer. If a truck load of Yoders just hunted your woods, you probably wont see deer. BUT, if you know you are in a good area that has deer, and you have predetermined the best place for you to sit in relation to the moons location, I WILL guarantee you that it will increase your odds of seeing deer up feeding on their feet, and ultimately the odds of you killing a deer.