The Farmer’s Almanac has all of kinds of info you can use to define astrological seasons. It tells you when Mercury is in retrograde, moon planting dates, conjuctions of the planets, moon phases, celestial transition times, sunrise and sunset times, the moon’s astrological place, best times to do certain things based on astrology (for example, the best days to bake are the 21-23 through this month). If anyone is a sea witch, it tells you tide times. Available in print and online. But I admit, it’s not as handy as the Google link Molly shared!
And, I’m also new to all this. If I’m still not understanding the question of astrological seasons…Molly, can we discuss that at a Tea Talk?