I am afraid that I must agree with Jonathan. It is not simply "various countries, cultures, religions. . ." that define seasons in a variety of ways, but more so different latitudes. The so-called "astronomical" dates might seem to be more objective and authoritative, but in defining seasons as phenomena that occur uniformly across an entire hemisphere, we ignore the curvature of the earth and the tremendous variation in climate that occurs between the equator and the poles. The astronomical dates might make sense for someone living on the moon and seeing the earth as a flat disc, but for those of us living on the surface of the earth, seasons start and end at a variety of times. I think that the OFA should resist the popular compulsion to have "official" dates for the seasons and instead accept the more scientifically and historically accurate definition of seasons as annual changes in levels of sunlight, temperature, and precipitation that vary according to latitude and climate.