One half hour before sunset is the beginning of "Magic Hour" when the light turns gorgeous. While it's a wonderful time for making photographs you should not schedule your wedding at that time. Why? It's possible that your wedding may run a little late or clouds may be on the horizon that day. If it does turn out to be especially beautiful you want that time to be able to set up the photos to take advantage of the cloud formations so you can get the most beautiful images.
Here is the schedule for Sedona. If you are in another location check out this web site for your local times.
