If your having your ceremony outside, remember to think about your guests along with what you are wanting for your big day. Take a moment to think about the lighting at the time of your ceremony. If possible visit your ceremony location around that time so you know what to expect with lighting. If it is hard for you to see and the sun is in your eyes, then it will be hard for your guests to see as well. That being said the harsh lighting also means a little more trouble for your photographer.