Nature doesn't follow a set pattern of "ok today it's the first day of spring on the human calender, so we'll change seasons....now", it does it's own thing in its own time and just "goes with the flow". To acknowledge that natures changing and to appreciate the differing parts of the year doesn't require a highly ritualistic ceremony on a specific date at a specific time. Some people really love to do it that way and it feels more special to them and that's great everyone needs to do what they FEEL is right. To me I find taking a moment of your time to just step back and go "wow so beautiful", i.e. "to stop and smell the roses" is just as good, otherwise I find I spend too much time trying to concentrate on the order and the correct words rather than appreciating the event at hand.